# SMTP Component The SMTP Class is used to send internet mail using the SMTP protocol (the internet mail standard). ## Syntax ```text ipworks.SMTP ``` ## Remarks The SMTP Struct supports both plaintext and Secure Sockets Layer/Transport Layer Security (SSL/TLS) connections (RFC 2487). When connecting over Secure Sockets Layer/Transport Layer Security (SSL/TLS) the [SSLServerAuthentication](#sslserverauthentication-event-smtp-component) event allows you to check the server identity and other security attributes. The [SSLStatus](#sslstatus-event-smtp-component) event provides information about the SSL handshake. Additional SSL-related settings are also supported through the [Config](#config-method-smtp-component) method. The SMTP Struct implements a standard SMTP client as specified in RFC 821. It has a simple plug-and-play interface. It contains a number of properties, such as [SendTo](#sendto-property-smtp-component), [Subject](#subject-property-smtp-component), [From](#from-property-smtp-component), [Cc](#cc-property-smtp-component), and [BCc](#bcc-property-smtp-component), that map directly to the internet mail message headers with the same name (RFC 822). The message text is set in [MessageText](#messagetext-property-smtp-component). Messages are sent by calling the [Send](#send-method-smtp-component) method. The struct supports message delivery to multiple recipients through the [SendTo](#sendto-property-smtp-component), [Cc](#cc-property-smtp-component), and [BCc](#bcc-property-smtp-component) properties. Simply specify the destination email addresses separated by commas. The interface of the struct is open-ended. New features, including MIME attachments, can be supported by using the [OtherHeaders](#otherheaders-property-smtp-component) property. A number of events provide feedback during the operation of the struct. The [Transfer](#transfer-event-smtp-component) event is fired during message delivery to show the number of bytes delivered. The [PITrail](#pitrail-event-smtp-component) event traces the commands that are sent to the server and the respective replies. ## Property List *The following is the full list of the properties of the component with short descriptions. Click on the links for further details.* | | | | --- | --- | | [AllowExtensions](#allowextensions-property-smtp-component) | This property is a switch allowing the class to use ESMTP features (Extended SMTP). | | [AuthMechanism](#authmechanism-property-smtp-component) | This property is used when connecting to the mail server. | | [BCc](#bcc-property-smtp-component) | This property includes a comma-separated list of addresses for blind carbon copies (optional). | | [Cc](#cc-property-smtp-component) | This property includes a comma-separated list of addresses for carbon copies (optional). | | [Connected](#connected-property-smtp-component) | Whether the class is connected. | | [DeliveryNotificationTo](#deliverynotificationto-property-smtp-component) | This property includes the email address to which to send a delivery notification. | | [FirewallAutoDetect](#firewallautodetect-property-smtp-component) | Whether to automatically detect and use firewall system settings, if available. | | [FirewallType](#firewalltype-property-smtp-component) | The type of firewall to connect through. | | [FirewallHost](#firewallhost-property-smtp-component) | The name or IP address of the firewall (optional). | | [FirewallPassword](#firewallpassword-property-smtp-component) | A password if authentication is to be used when connecting through the firewall. | | [FirewallPort](#firewallport-property-smtp-component) | The Transmission Control Protocol (TCP) port for the firewall Host . | | [FirewallUser](#firewalluser-property-smtp-component) | A username if authentication is to be used when connecting through a firewall. | | [From](#from-property-smtp-component) | This property includes the email address of the sender (required). | | [Idle](#idle-property-smtp-component) | The current status of the class. | | [Importance](#importance-property-smtp-component) | This property indicates the importance of the mail message (optional). | | [LastReply](#lastreply-property-smtp-component) | This property indicates the last reply received from the server. | | [LocalHost](#localhost-property-smtp-component) | The name of the local host or user-assigned IP interface through which connections are initiated or accepted. | | [MailPort](#mailport-property-smtp-component) | This property includes the server port for SMTP (default 25). | | [MailServer](#mailserver-property-smtp-component) | This property includes the name or address of a mail server (mail relay). | | [Message](#message-property-smtp-component) | This property provides a way to set the raw message content. | | [MessageDate](#messagedate-property-smtp-component) | This property includes the date of the mail message (optional). | | [MessageHeaderCount](#messageheadercount-property-smtp-component) | The number of records in the MessageHeader arrays. | | [MessageHeaderField](#messageheaderfield-property-smtp-component) | This property contains the name of the HTTP header (this is the same case as it is delivered). | | [MessageHeaderValue](#messageheadervalue-property-smtp-component) | This property contains the header contents. | | [MessageHeadersString](#messageheadersstring-property-smtp-component) | This property includes the string representation of RFC 822-encoded headers of the message. | | [MessageId](#messageid-property-smtp-component) | This property includes the message identifier for the message. | | [MessageRecipientCount](#messagerecipientcount-property-smtp-component) | The number of records in the MessageRecipient arrays. | | [MessageRecipientAddress](#messagerecipientaddress-property-smtp-component) | This property contains the email address of the recipient. | | [MessageRecipientName](#messagerecipientname-property-smtp-component) | This property contains the name of the recipient. | | [MessageRecipientOptions](#messagerecipientoptions-property-smtp-component) | This property contains the recipient sending options (used only by SMTP). | | [MessageRecipientType](#messagerecipienttype-property-smtp-component) | This property contains the recipient type: To, Cc, or Bcc. | | [MessageText](#messagetext-property-smtp-component) | This property includes the full text of the message to send (without headers). | | [OAuthAccessToken](#oauthaccesstoken-property-smtp-component) | The access token returned by the authorization server. | | [OAuthAuthorizationScope](#oauthauthorizationscope-property-smtp-component) | The scope request or response parameter used during authorization. | | [OAuthClientId](#oauthclientid-property-smtp-component) | The id of the client assigned when registering the application. | | [OAuthClientSecret](#oauthclientsecret-property-smtp-component) | The secret value for the client assigned when registering the application. | | [OAuthRefreshToken](#oauthrefreshtoken-property-smtp-component) | Specifies the refresh token received from or sent to the authorization server. | | [OAuthReturnURL](#oauthreturnurl-property-smtp-component) | The URL where the user (browser) returns after authenticating. | | [OAuthServerAuthURL](#oauthserverauthurl-property-smtp-component) | The URL of the authorization server. | | [OAuthServerTokenURL](#oauthservertokenurl-property-smtp-component) | The URL of the token server used to obtain the access token. | | [OtherHeaders](#otherheaders-property-smtp-component) | This property includes an RFC 822-compliant string consisting of extra headers. | | [Password](#password-property-smtp-component) | This property includes a password for logon to the MailServer . | | [Priority](#priority-property-smtp-component) | This property includes the priority of the mail message (optional). | | [ReadReceiptTo](#readreceiptto-property-smtp-component) | This property includes the email address to send a read-receipt to. | | [ReplyTo](#replyto-property-smtp-component) | This property includes a mail address to which to reply (optional). | | [ReturnPath](#returnpath-property-smtp-component) | This property sets the Return-Path to be used for sending email. | | [SendTo](#sendto-property-smtp-component) | This property includes a comma-separated list of addresses for destinations (required). | | [Sensitivity](#sensitivity-property-smtp-component) | This property indicates the sensitivity of the mail message (optional). | | [SSLAcceptServerCertEffectiveDate](#sslacceptservercerteffectivedate-property-smtp-component) | The date on which this certificate becomes valid. | | [SSLAcceptServerCertExpirationDate](#sslacceptservercertexpirationdate-property-smtp-component) | The date on which the certificate expires. | | [SSLAcceptServerCertExtendedKeyUsage](#sslacceptservercertextendedkeyusage-property-smtp-component) | A comma-delimited list of extended key usage identifiers. | | [SSLAcceptServerCertFingerprint](#sslacceptservercertfingerprint-property-smtp-component) | The hex-encoded, 16-byte MD5 fingerprint of the certificate. | | [SSLAcceptServerCertFingerprintSHA1](#sslacceptservercertfingerprintsha1-property-smtp-component) | The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. | | [SSLAcceptServerCertFingerprintSHA256](#sslacceptservercertfingerprintsha256-property-smtp-component) | The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. | | [SSLAcceptServerCertIssuer](#sslacceptservercertissuer-property-smtp-component) | The issuer of the certificate. | | [SSLAcceptServerCertPrivateKey](#sslacceptservercertprivatekey-property-smtp-component) | The private key of the certificate (if available). | | [SSLAcceptServerCertPrivateKeyAvailable](#sslacceptservercertprivatekeyavailable-property-smtp-component) | Whether a PrivateKey is available for the selected certificate. | | [SSLAcceptServerCertPrivateKeyContainer](#sslacceptservercertprivatekeycontainer-property-smtp-component) | The name of the PrivateKey container for the certificate (if available). | | [SSLAcceptServerCertPublicKey](#sslacceptservercertpublickey-property-smtp-component) | The public key of the certificate. | | [SSLAcceptServerCertPublicKeyAlgorithm](#sslacceptservercertpublickeyalgorithm-property-smtp-component) | The textual description of the certificate's public key algorithm. | | [SSLAcceptServerCertPublicKeyLength](#sslacceptservercertpublickeylength-property-smtp-component) | The length of the certificate's public key (in bits). | | [SSLAcceptServerCertSerialNumber](#sslacceptservercertserialnumber-property-smtp-component) | The serial number of the certificate encoded as a string. | | [SSLAcceptServerCertSignatureAlgorithm](#sslacceptservercertsignaturealgorithm-property-smtp-component) | The text description of the certificate's signature algorithm. | | [SSLAcceptServerCertStore](#sslacceptservercertstore-property-smtp-component) | The name of the certificate store for the client certificate. | | [SSLAcceptServerCertStorePassword](#sslacceptservercertstorepassword-property-smtp-component) | If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store. | | [SSLAcceptServerCertStoreType](#sslacceptservercertstoretype-property-smtp-component) | The type of certificate store for this certificate. | | [SSLAcceptServerCertSubjectAltNames](#sslacceptservercertsubjectaltnames-property-smtp-component) | Comma-separated lists of alternative subject names for the certificate. | | [SSLAcceptServerCertThumbprintMD5](#sslacceptservercertthumbprintmd5-property-smtp-component) | The MD5 hash of the certificate. | | [SSLAcceptServerCertThumbprintSHA1](#sslacceptservercertthumbprintsha1-property-smtp-component) | The SHA-1 hash of the certificate. | | [SSLAcceptServerCertThumbprintSHA256](#sslacceptservercertthumbprintsha256-property-smtp-component) | The SHA-256 hash of the certificate. | | [SSLAcceptServerCertUsage](#sslacceptservercertusage-property-smtp-component) | The text description of UsageFlags . | | [SSLAcceptServerCertUsageFlags](#sslacceptservercertusageflags-property-smtp-component) | The flags that show intended use for the certificate. | | [SSLAcceptServerCertVersion](#sslacceptservercertversion-property-smtp-component) | The certificate's version number. | | [SSLAcceptServerCertSubject](#sslacceptservercertsubject-property-smtp-component) | The subject of the certificate used for client authentication. | | [SSLAcceptServerCertEncoded](#sslacceptservercertencoded-property-smtp-component) | The certificate (PEM/Base64 encoded). | | [SSLCertEffectiveDate](#sslcerteffectivedate-property-smtp-component) | The date on which this certificate becomes valid. | | [SSLCertExpirationDate](#sslcertexpirationdate-property-smtp-component) | The date on which the certificate expires. | | [SSLCertExtendedKeyUsage](#sslcertextendedkeyusage-property-smtp-component) | A comma-delimited list of extended key usage identifiers. | | [SSLCertFingerprint](#sslcertfingerprint-property-smtp-component) | The hex-encoded, 16-byte MD5 fingerprint of the certificate. | | [SSLCertFingerprintSHA1](#sslcertfingerprintsha1-property-smtp-component) | The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. | | [SSLCertFingerprintSHA256](#sslcertfingerprintsha256-property-smtp-component) | The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. | | [SSLCertIssuer](#sslcertissuer-property-smtp-component) | The issuer of the certificate. | | [SSLCertPrivateKey](#sslcertprivatekey-property-smtp-component) | The private key of the certificate (if available). | | [SSLCertPrivateKeyAvailable](#sslcertprivatekeyavailable-property-smtp-component) | Whether a PrivateKey is available for the selected certificate. | | [SSLCertPrivateKeyContainer](#sslcertprivatekeycontainer-property-smtp-component) | The name of the PrivateKey container for the certificate (if available). | | [SSLCertPublicKey](#sslcertpublickey-property-smtp-component) | The public key of the certificate. | | [SSLCertPublicKeyAlgorithm](#sslcertpublickeyalgorithm-property-smtp-component) | The textual description of the certificate's public key algorithm. | | [SSLCertPublicKeyLength](#sslcertpublickeylength-property-smtp-component) | The length of the certificate's public key (in bits). | | [SSLCertSerialNumber](#sslcertserialnumber-property-smtp-component) | The serial number of the certificate encoded as a string. | | [SSLCertSignatureAlgorithm](#sslcertsignaturealgorithm-property-smtp-component) | The text description of the certificate's signature algorithm. | | [SSLCertStore](#sslcertstore-property-smtp-component) | The name of the certificate store for the client certificate. | | [SSLCertStorePassword](#sslcertstorepassword-property-smtp-component) | If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store. | | [SSLCertStoreType](#sslcertstoretype-property-smtp-component) | The type of certificate store for this certificate. | | [SSLCertSubjectAltNames](#sslcertsubjectaltnames-property-smtp-component) | Comma-separated lists of alternative subject names for the certificate. | | [SSLCertThumbprintMD5](#sslcertthumbprintmd5-property-smtp-component) | The MD5 hash of the certificate. | | [SSLCertThumbprintSHA1](#sslcertthumbprintsha1-property-smtp-component) | The SHA-1 hash of the certificate. | | [SSLCertThumbprintSHA256](#sslcertthumbprintsha256-property-smtp-component) | The SHA-256 hash of the certificate. | | [SSLCertUsage](#sslcertusage-property-smtp-component) | The text description of UsageFlags . | | [SSLCertUsageFlags](#sslcertusageflags-property-smtp-component) | The flags that show intended use for the certificate. | | [SSLCertVersion](#sslcertversion-property-smtp-component) | The certificate's version number. | | [SSLCertSubject](#sslcertsubject-property-smtp-component) | The subject of the certificate used for client authentication. | | [SSLCertEncoded](#sslcertencoded-property-smtp-component) | The certificate (PEM/Base64 encoded). | | [SSLEnabled](#sslenabled-property-smtp-component) | This property indicates whether Transport Layer Security/Secure Sockets Layer (TLS/SSL) is enabled. | | [SSLProvider](#sslprovider-property-smtp-component) | The Secure Sockets Layer/Transport Layer Security (SSL/TLS) implementation to use. | | [SSLServerCertEffectiveDate](#sslservercerteffectivedate-property-smtp-component) | The date on which this certificate becomes valid. | | [SSLServerCertExpirationDate](#sslservercertexpirationdate-property-smtp-component) | The date on which the certificate expires. | | [SSLServerCertExtendedKeyUsage](#sslservercertextendedkeyusage-property-smtp-component) | A comma-delimited list of extended key usage identifiers. | | [SSLServerCertFingerprint](#sslservercertfingerprint-property-smtp-component) | The hex-encoded, 16-byte MD5 fingerprint of the certificate. | | [SSLServerCertFingerprintSHA1](#sslservercertfingerprintsha1-property-smtp-component) | The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. | | [SSLServerCertFingerprintSHA256](#sslservercertfingerprintsha256-property-smtp-component) | The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. | | [SSLServerCertIssuer](#sslservercertissuer-property-smtp-component) | The issuer of the certificate. | | [SSLServerCertPrivateKey](#sslservercertprivatekey-property-smtp-component) | The private key of the certificate (if available). | | [SSLServerCertPrivateKeyAvailable](#sslservercertprivatekeyavailable-property-smtp-component) | Whether a PrivateKey is available for the selected certificate. | | [SSLServerCertPrivateKeyContainer](#sslservercertprivatekeycontainer-property-smtp-component) | The name of the PrivateKey container for the certificate (if available). | | [SSLServerCertPublicKey](#sslservercertpublickey-property-smtp-component) | The public key of the certificate. | | [SSLServerCertPublicKeyAlgorithm](#sslservercertpublickeyalgorithm-property-smtp-component) | The textual description of the certificate's public key algorithm. | | [SSLServerCertPublicKeyLength](#sslservercertpublickeylength-property-smtp-component) | The length of the certificate's public key (in bits). | | [SSLServerCertSerialNumber](#sslservercertserialnumber-property-smtp-component) | The serial number of the certificate encoded as a string. | | [SSLServerCertSignatureAlgorithm](#sslservercertsignaturealgorithm-property-smtp-component) | The text description of the certificate's signature algorithm. | | [SSLServerCertStore](#sslservercertstore-property-smtp-component) | The name of the certificate store for the client certificate. | | [SSLServerCertStorePassword](#sslservercertstorepassword-property-smtp-component) | If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store. | | [SSLServerCertStoreType](#sslservercertstoretype-property-smtp-component) | The type of certificate store for this certificate. | | [SSLServerCertSubjectAltNames](#sslservercertsubjectaltnames-property-smtp-component) | Comma-separated lists of alternative subject names for the certificate. | | [SSLServerCertThumbprintMD5](#sslservercertthumbprintmd5-property-smtp-component) | The MD5 hash of the certificate. | | [SSLServerCertThumbprintSHA1](#sslservercertthumbprintsha1-property-smtp-component) | The SHA-1 hash of the certificate. | | [SSLServerCertThumbprintSHA256](#sslservercertthumbprintsha256-property-smtp-component) | The SHA-256 hash of the certificate. | | [SSLServerCertUsage](#sslservercertusage-property-smtp-component) | The text description of UsageFlags . | | [SSLServerCertUsageFlags](#sslservercertusageflags-property-smtp-component) | The flags that show intended use for the certificate. | | [SSLServerCertVersion](#sslservercertversion-property-smtp-component) | The certificate's version number. | | [SSLServerCertSubject](#sslservercertsubject-property-smtp-component) | The subject of the certificate used for client authentication. | | [SSLServerCertEncoded](#sslservercertencoded-property-smtp-component) | The certificate (PEM/Base64 encoded). | | [SSLStartMode](#sslstartmode-property-smtp-component) | This property determines how the class starts the Secure Sockets Layer (SSL) negotiation. | | [Subject](#subject-property-smtp-component) | This property includes the subject of the mail message (optional). | | [Timeout](#timeout-property-smtp-component) | The timeout for the class. | | [User](#user-property-smtp-component) | This property includes the user identifier needed to log in as in the MailServer . | ## Method List *The following is the full list of the methods of the component with short descriptions. Click on the links for further details.* | | | | --- | --- | | [Config](#config-method-smtp-component) | Sets or retrieves a configuration setting. | | [Connect](#connect-method-smtp-component) | This method connects to the mail relay and sends the SMTP HELO command. | | [Disconnect](#disconnect-method-smtp-component) | This method disconnects from the SMTP server. | | [DoEvents](#doevents-method-smtp-component) | This method processes events from the internal message queue. | | [Expand](#expand-method-smtp-component) | This method asks the MailServer to expand a name or mailing list. | | [Interrupt](#interrupt-method-smtp-component) | This method interrupts the current method. | | [ProcessQueue](#processqueue-method-smtp-component) | This method sends the messages that previously have been queued into QueueDir . | | [Queue](#queue-method-smtp-component) | This method queues the message into QueueDir . | | [Reset](#reset-method-smtp-component) | This method will reset the class. | | [ResetHeaders](#resetheaders-method-smtp-component) | This method resets all the message headers to empty. | | [Send](#send-method-smtp-component) | This method sends the current message. | | [SendCommand](#sendcommand-method-smtp-component) | This method sends the exact command directly to the server. | | [SendToTerminalAndEmail](#sendtoterminalandemail-method-smtp-component) | This method sends to terminal and email. | | [SendToTerminalOnly](#sendtoterminalonly-method-smtp-component) | This method sends to terminal only. | | [SendToTerminalOrEmail](#sendtoterminaloremail-method-smtp-component) | This method sends to terminal or email. | | [Verify](#verify-method-smtp-component) | This method sends a verification request to the SMTP server. | ## Event List *The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.* | | | | --- | --- | | [ConnectionStatus](#connectionstatus-event-smtp-component) | Fired to indicate changes in the connection state. | | [EndTransfer](#endtransfer-event-smtp-component) | This event is fired when the message text completes transferring. | | [Error](#error-event-smtp-component) | Fired when information is available about errors during data delivery. | | [Expand](#expand-event-smtp-component) | This event is fired for every email address returned by the server when the Expand method is called. | | [LaunchBrowser](#launchbrowser-event-smtp-component) | Fires before launching a browser with the authorization URL. | | [Log](#log-event-smtp-component) | Fired once for each log message. | | [PITrail](#pitrail-event-smtp-component) | This event traces the commands sent to the mail server, and the respective replies. | | [SSLServerAuthentication](#sslserverauthentication-event-smtp-component) | Fired after the server presents its certificate to the client. | | [SSLStatus](#sslstatus-event-smtp-component) | Fired when secure connection progress messages are available. | | [StartTransfer](#starttransfer-event-smtp-component) | This event is fired when the message text starts transferring. | | [Transfer](#transfer-event-smtp-component) | This event is fired when the message text is transferred to MailServer . | ## Config Settings *The following is a list of config settings for the component with short descriptions. Click on the links for further details.* | | | | --- | --- | | [AllowEmptyTo](#AllowEmptyTo) | If set to True, then the SendTo property is not required. | | [AuthorizationIdentity](#AuthorizationIdentity) | The value to use as the authorization identity when SASL authentication is used. | | [Charset](#Charset) | When set, the message headers will be encoded using the specified Charset. | | [Hello](#Hello) | The argument for HELO (herald) command to the server (defaults to local host name). | | [KeepQueue](#KeepQueue) | If set to True, queued files are not deleted after a successful send. | | [MaxHeaderLength](#MaxHeaderLength) | Maximum length for headers to avoid line folding (default 80). | | [MessageHeadersString](#MessageHeadersString) | String representation of RFC822-encoded headers of the message. | | [MessageIdAlgorithm](#MessageIdAlgorithm) | Determines the algorithm used to hash the random MessageId. | | [OtherHeaders](#OtherHeaders) | An RFC 822 compliant string consisting of extra headers. | | [ReturnPath](#ReturnPath) | Sets the Return-Path to be used for sending email. | | [SendRSET](#SendRSET) | Whether to send RSET command. | | [StopOnBccErrors](#StopOnBccErrors) | Instructs the class to stop sending the message if the server does not acknowledge any of the BCCs. | | [StopOnCcErrors](#StopOnCcErrors) | Instructs the class to stop sending the message if the server does not acknowledge any of the CCs. | | [StopOnToErrors](#StopOnToErrors) | Instructs the class to stop sending the message if the server does not acknowledge any of the TOs. | | [TransferText](#TransferText) | String representation of RFC822-encoded body of the message. | | [ConnectionTimeout](#ConnectionTimeout) | Sets a separate timeout value for establishing a connection. | | [FirewallAutoDetect](#FirewallAutoDetect) | Tells the class whether or not to automatically detect and use firewall system settings, if available. | | [FirewallHost](#FirewallHost) | Name or IP address of firewall (optional). | | [FirewallHTTPVersion](#FirewallHTTPVersion) | The HTTP version to be used when connecting through a tunneling proxy. | | [FirewallPassword](#FirewallPassword) | Password to be used if authentication is to be used when connecting through the firewall. | | [FirewallPort](#FirewallPort) | The TCP port for the FirewallHost;. | | [FirewallType](#FirewallType) | Determines the type of firewall to connect through. | | [FirewallUser](#FirewallUser) | A user name if authentication is to be used connecting through a firewall. | | [KeepAliveInterval](#KeepAliveInterval) | The retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received. | | [KeepAliveTime](#KeepAliveTime) | The inactivity time in milliseconds before a TCP keep-alive packet is sent. | | [Linger](#Linger) | When set to True, connections are terminated gracefully. | | [LingerTime](#LingerTime) | Time in seconds to have the connection linger. | | [LocalHost](#LocalHost) | The name of the local host through which connections are initiated or accepted. | | [LocalPort](#LocalPort) | The port in the local host where the class binds. | | [MaxLineLength](#MaxLineLength) | The maximum amount of data to accumulate when no EOL is found. | | [MaxTransferRate](#MaxTransferRate) | The transfer rate limit in bytes per second. | | [ProxyExceptionsList](#ProxyExceptionsList) | A semicolon separated list of hosts and IPs to bypass when using a proxy. | | [TCPKeepAlive](#TCPKeepAlive) | Determines whether or not the keep alive socket option is enabled. | | [TcpNoDelay](#TcpNoDelay) | Whether or not to delay when sending packets. | | [UseIPv6](#UseIPv6) | Whether to use IPv6. | | [UseNTLMv2](#UseNTLMv2) | Whether to use NTLM V2. | | [LogSSLPackets](#LogSSLPackets) | Controls whether SSL packets are logged when using the internal security API. | | [OpenSSLCADir](#OpenSSLCADir) | The path to a directory containing CA certificates. | | [OpenSSLCAFile](#OpenSSLCAFile) | Name of the file containing the list of CA's trusted by your application. | | [OpenSSLCipherList](#OpenSSLCipherList) | A string that controls the ciphers to be used by SSL. | | [OpenSSLPrngSeedData](#OpenSSLPrngSeedData) | The data to seed the pseudo random number generator (PRNG). | | [ReuseSSLSession](#ReuseSSLSession) | Determines if the SSL session is reused. | | [SSLCACerts](#SSLCACerts) | A newline separated list of CA certificates to be included when performing an SSL handshake. | | [SSLCheckCRL](#SSLCheckCRL) | Whether to check the Certificate Revocation List for the server certificate. | | [SSLCheckOCSP](#SSLCheckOCSP) | Whether to use OCSP to check the status of the server certificate. | | [SSLCipherStrength](#SSLCipherStrength) | The minimum cipher strength used for bulk encryption. | | [SSLClientCACerts](#SSLClientCACerts) | A newline separated list of CA certificates to use during SSL client certificate validation. | | [SSLEnabledCipherSuites](#SSLEnabledCipherSuites) | The cipher suite to be used in an SSL negotiation. | | [SSLEnabledProtocols](#SSLEnabledProtocols) | Used to enable/disable the supported security protocols. | | [SSLEnableRenegotiation](#SSLEnableRenegotiation) | Whether the renegotiation_info SSL extension is supported. | | [SSLIncludeCertChain](#SSLIncludeCertChain) | Whether the entire certificate chain is included in the SSLServerAuthentication event. | | [SSLKeyLogFile](#SSLKeyLogFile) | The location of a file where per-session secrets are written for debugging purposes. | | [SSLNegotiatedCipher](#SSLNegotiatedCipher) | Returns the negotiated cipher suite. | | [SSLNegotiatedCipherStrength](#SSLNegotiatedCipherStrength) | Returns the negotiated cipher suite strength. | | [SSLNegotiatedCipherSuite](#SSLNegotiatedCipherSuite) | Returns the negotiated cipher suite. | | [SSLNegotiatedKeyExchange](#SSLNegotiatedKeyExchange) | Returns the negotiated key exchange algorithm. | | [SSLNegotiatedKeyExchangeStrength](#SSLNegotiatedKeyExchangeStrength) | Returns the negotiated key exchange algorithm strength. | | [SSLNegotiatedVersion](#SSLNegotiatedVersion) | Returns the negotiated protocol version. | | [SSLSecurityFlags](#SSLSecurityFlags) | Flags that control certificate verification. | | [SSLServerCACerts](#SSLServerCACerts) | A newline separated list of CA certificates to use during SSL server certificate validation. | | [TLS12SignatureAlgorithms](#TLS12SignatureAlgorithms) | Defines the allowed TLS 1.2 signature algorithms when SSLProvider is set to Internal. | | [TLS12SupportedGroups](#TLS12SupportedGroups) | The supported groups for ECC. | | [TLS13KeyShareGroups](#TLS13KeyShareGroups) | The groups for which to pregenerate key shares. | | [TLS13SignatureAlgorithms](#TLS13SignatureAlgorithms) | The allowed certificate signature algorithms. | | [TLS13SupportedGroups](#TLS13SupportedGroups) | The supported groups for (EC)DHE key exchange. | | [AbsoluteTimeout](#AbsoluteTimeout) | Determines whether timeouts are inactivity timeouts or absolute timeouts. | | [FirewallData](#FirewallData) | Used to send extra data to the firewall. | | [InBufferSize](#InBufferSize) | The size in bytes of the incoming queue of the socket. | | [OutBufferSize](#OutBufferSize) | The size in bytes of the outgoing queue of the socket. | | [BuildInfo](#BuildInfo) | Information about the product's build. | | [CodePage](#CodePage) | The system code page used for Unicode to Multibyte translations. | | [LicenseInfo](#LicenseInfo) | Information about the current license. | | [MaskSensitiveData](#MaskSensitiveData) | Whether sensitive data is masked in log messages. | | [UseInternalSecurityAPI](#UseInternalSecurityAPI) | Whether or not to use the system security libraries or an internal implementation. | # AllowExtensions Property ([SMTP](#smtp-component) Component) This property is a switch allowing the class to use ESMTP features (Extended SMTP). ## Syntax *Go Syntax* ```text func (obj *SMTP) AllowExtensions() (bool, error)func (obj *SMTP) SetAllowExtensions(value bool) error ``` ## Default Value true ## Remarks This property is a switch allowing the struct to use ESMTP features (Extended SMTP). If this property is True, the struct will first send the EHLO greeting (Extended Hello) to the server and, if that fails, the standard HELO command will be sent. This property is True by default but may be disabled if it is known in advance that the [MailServer](#mailserver-property-smtp-component) does not support SMTP extensions. ## Data Type **bool** # AuthMechanism Property ([SMTP](#smtp-component) Component) This property is used when connecting to the mail server. ## Syntax *Go Syntax* ```text func (obj *SMTP) AuthMechanism() (int32, error)func (obj *SMTP) SetAuthMechanism(value int32) error ``` ## Possible Values ```text 0 // UserPassword1 // CRAMMD52 // NTLM3 // APOP4 // SASLPlain5 // SASLDigestMD56 // Kerberos7 // XOAUTH2 ``` ## Default Value 0 ## Remarks This is the authentication mechanism property to be used when connecting to the mail server. By default, this property is amUserPassword (0), and if the [User](#user-property-smtp-component) and [Password](#password-property-smtp-component) properties are set, the AUTH command is sent to the server for authentication. If this property is set to amCRAMMD5 (1), CRAM-MD5 authentication is used instead. If this property is set to amNTLM (2), NTLM authentication will be used. If this property is set to amKerberos (6), Kerberos authentication will be used. NOTE: This functionality is available only in Windows. When set to amXOAUTH2 (7), set [User](#user-property-smtp-component) to the username and [AuthorizationIdentity](#AuthorizationIdentity) to the OAuth token. See [AuthorizationIdentity](#AuthorizationIdentity) for details. ## Data Type **int32** # BCc Property ([SMTP](#smtp-component) Component) This property includes a comma-separated list of addresses for blind carbon copies (optional). ## Syntax *Go Syntax* ```text func (obj *SMTP) BCc() (string, error)func (obj *SMTP) SetBCc(value string) error ``` ## Default Value "" ## Remarks This property specifies a comma-separated list of destinations for blind carbon copies of the mail message. A copy of the message is sent to each destination. Because no *BCc* SMTP header is created containing the destination addresses, individual recipients never see the list of the other recipients. The struct will return an error if the [MailServer](#mailserver-property-smtp-component) returns an error code about any email address specified in [SendTo](#sendto-property-smtp-component) or [Cc](#cc-property-smtp-component) but it will fire an [Error](#error-event-smtp-component) event only if the same thing happens with an email address specified in this property. If the resulting header is longer than [MaxHeaderLength](#MaxHeaderLength), then it is folded according to RFC 822 specifications. NOTE: You must clear the MessageRecipients properties before setting this property to remove previous recipients. ## Data Type **string** # Cc Property ([SMTP](#smtp-component) Component) This property includes a comma-separated list of addresses for carbon copies (optional). ## Syntax *Go Syntax* ```text func (obj *SMTP) Cc() (string, error)func (obj *SMTP) SetCc(value string) error ``` ## Default Value "" ## Remarks This property specifies a comma-separated list of destinations for carbon copies of the mail message. A copy of the message is sent to each destination, and a *Cc* SMTP header is created containing the destination addresses. This header is sent to every recipient of the message. If you don't want to copy this information to every recipient, then use blind carbon copies instead (see the description of the [BCc](#bcc-property-smtp-component)). The struct will return an error if the [MailServer](#mailserver-property-smtp-component) returns an error code about any email address specified in [SendTo](#sendto-property-smtp-component) or Cc but it will fire an [Error](#error-event-smtp-component) event only if the same thing happens with an email address specified in [BCc](#bcc-property-smtp-component). If the resulting header is longer than [MaxHeaderLength](#MaxHeaderLength), then it is folded according to RFC 822 specifications. NOTE: You must clear the MessageRecipients properties before setting this property to remove previous recipients. ## Data Type **string** # Connected Property ([SMTP](#smtp-component) Component) Whether the class is connected. ## Syntax *Go Syntax* ```text func (obj *SMTP) Connected() (bool, error) ``` ## Default Value false ## Remarks This property is used to determine whether or not the struct is connected to the remote host. Use the [Connect](#connect-method-smtp-component) and [Disconnect](#disconnect-method-smtp-component) methods to manage the connection. This property is read-only. ## Data Type **bool** # DeliveryNotificationTo Property ([SMTP](#smtp-component) Component) This property includes the email address to which to send a delivery notification. ## Syntax *Go Syntax* ```text func (obj *SMTP) DeliveryNotificationTo() (string, error)func (obj *SMTP) SetDeliveryNotificationTo(value string) error ``` ## Default Value "" ## Remarks This property contains the email address to send to which to send a delivery notification. When set, a Return-Receipt-To header is added to the message. This property should be set to an email address that can receive the delivery notification. ## Data Type **string** # FirewallAutoDetect Property ([SMTP](#smtp-component) Component) Whether to automatically detect and use firewall system settings, if available. ## Syntax *Go Syntax* ```text func (obj *SMTP) FirewallAutoDetect() (bool, error)func (obj *SMTP) SetFirewallAutoDetect(value bool) error ``` ## Default Value false ## Remarks Whether to automatically detect and use firewall system settings, if available. ## Data Type **bool** # FirewallType Property ([SMTP](#smtp-component) Component) The type of firewall to connect through. ## Syntax *Go Syntax* ```text func (obj *SMTP) FirewallType() (int32, error)func (obj *SMTP) SetFirewallType(value int32) error ``` ## Possible Values ```text 0 // None1 // Tunnel2 // SOCKS43 // SOCKS510 // SOCKS4A ``` ## Default Value 0 ## Remarks The type of firewall to connect through. The applicable values are as follows: | | | | --- | --- | | fwNone (0) | No firewall (default setting). | | fwTunnel (1) | Connect through a tunneling proxy. [FirewallPort](#firewallport-property-smtp-component) is set to 80. | | fwSOCKS4 (2) | Connect through a SOCKS4 Proxy. [FirewallPort](#firewallport-property-smtp-component) is set to 1080. | | fwSOCKS5 (3) | Connect through a SOCKS5 Proxy. [FirewallPort](#firewallport-property-smtp-component) is set to 1080. | | fwSOCKS4A (10) | Connect through a SOCKS4A Proxy. [FirewallPort](#firewallport-property-smtp-component) is set to 1080. | ## Data Type **int32** # FirewallHost Property ([SMTP](#smtp-component) Component) The name or IP address of the firewall (optional). ## Syntax *Go Syntax* ```text func (obj *SMTP) FirewallHost() (string, error)func (obj *SMTP) SetFirewallHost(value string) error ``` ## Default Value "" ## Remarks The name or IP address of the firewall (optional). If a [FirewallHost](#firewallhost-property-smtp-component) is given, the requested connections will be authenticated through the specified firewall when connecting. If this property is set to a Domain Name, a DNS request is initiated. Upon successful termination of the request, this property is set to the corresponding address. If the search is not successful, the struct fails with an error. ## Data Type **string** # FirewallPassword Property ([SMTP](#smtp-component) Component) A password if authentication is to be used when connecting through the firewall. ## Syntax *Go Syntax* ```text func (obj *SMTP) FirewallPassword() (string, error)func (obj *SMTP) SetFirewallPassword(value string) error ``` ## Default Value "" ## Remarks A password if authentication is to be used when connecting through the firewall. If [FirewallHost](#firewallhost-property-smtp-component) is specified, the [FirewallUser](#firewalluser-property-smtp-component) and [FirewallPassword](#firewallpassword-property-smtp-component) properties are used to connect and authenticate to the given firewall. If the authentication fails, the struct fails with an error. ## Data Type **string** # FirewallPort Property ([SMTP](#smtp-component) Component) The Transmission Control Protocol (TCP) port for the firewall Host . ## Syntax *Go Syntax* ```text func (obj *SMTP) FirewallPort() (int32, error)func (obj *SMTP) SetFirewallPort(value int32) error ``` ## Default Value 0 ## Remarks The Transmission Control Protocol (TCP) port for the firewall [FirewallHost](#firewallhost-property-smtp-component). See the description of the [FirewallHost](#firewallhost-property-smtp-component) property for details. NOTE: This property is set automatically when [FirewallType](#firewalltype-property-smtp-component) is set to a valid value. See the description of the [FirewallType](#firewalltype-property-smtp-component) property for details. ## Data Type **int32** # FirewallUser Property ([SMTP](#smtp-component) Component) A username if authentication is to be used when connecting through a firewall. ## Syntax *Go Syntax* ```text func (obj *SMTP) FirewallUser() (string, error)func (obj *SMTP) SetFirewallUser(value string) error ``` ## Default Value "" ## Remarks A username if authentication is to be used when connecting through a firewall. If [FirewallHost](#firewallhost-property-smtp-component) is specified, this property and the [FirewallPassword](#firewallpassword-property-smtp-component) property are used to connect and authenticate to the given [Firewall](#Type_Firewall). If the authentication fails, the struct fails with an error. ## Data Type **string** # From Property ([SMTP](#smtp-component) Component) This property includes the email address of the sender (required). ## Syntax *Go Syntax* ```text func (obj *SMTP) From() (string, error)func (obj *SMTP) SetFrom(value string) error ``` ## Default Value "" ## Remarks This property is used to create a *From* SMTP header. This header identifies the sender of the message. A valid email address is required. Examples of valid addresses are as follows: *"Friendly Name" * or *address@company.com* If the resulting header is longer than [MaxHeaderLength](#MaxHeaderLength), then it is folded according to RFC 822 specifications. ## Data Type **string** # Idle Property ([SMTP](#smtp-component) Component) The current status of the class. ## Syntax *Go Syntax* ```text func (obj *SMTP) Idle() (bool, error) ``` ## Default Value true ## Remarks This property will be False if the component is currently busy (communicating or waiting for an answer), and True at all other times. This property is read-only. ## Data Type **bool** # Importance Property ([SMTP](#smtp-component) Component) This property indicates the importance of the mail message (optional). ## Syntax *Go Syntax* ```text func (obj *SMTP) Importance() (int32, error)func (obj *SMTP) SetImportance(value int32) error ``` ## Possible Values ```text 0 // Unspecified1 // High2 // Normal3 // Low ``` ## Default Value 0 ## Remarks This property indicates the importance of the mail message (optional). When set, an Importance header will be added to the message. Importance is an indication to the recipient(s) about the level of importance of the message. The possible values are Unspecified (0), High (1), Normal (2), and Low (3). ## Data Type **int32** # LastReply Property ([SMTP](#smtp-component) Component) This property indicates the last reply received from the server. ## Syntax *Go Syntax* ```text func (obj *SMTP) LastReply() (string, error) ``` ## Default Value "" ## Remarks This property indicates the last reply received from the server. It can be used for informational purposes. The same information and more also can be retrieved through the [PITrail](#pitrail-event-smtp-component) event. This property is read-only. ## Data Type **string** # LocalHost Property ([SMTP](#smtp-component) Component) The name of the local host or user-assigned IP interface through which connections are initiated or accepted. ## Syntax *Go Syntax* ```text func (obj *SMTP) LocalHost() (string, error)func (obj *SMTP) SetLocalHost(value string) error ``` ## Default Value "" ## Remarks This property contains the name of the local host as obtained by the *gethostname()* system call, or if the user has assigned an IP address, the value of that address. In multihomed hosts (machines with more than one IP interface) setting LocalHost to the IP address of an interface will make the struct initiate connections (or accept in the case of server structs) only through that interface. It is recommended to provide an IP address rather than a hostname when setting this property to ensure the desired interface is used. If the struct is connected, the LocalHost property shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multihomed hosts (machines with more than one IP interface). NOTE: LocalHost is not persistent. You must always set it in code, and never in the property window. ## Data Type **string** # MailPort Property ([SMTP](#smtp-component) Component) This property includes the server port for SMTP (default 25). ## Syntax *Go Syntax* ```text func (obj *SMTP) MailPort() (int32, error)func (obj *SMTP) SetMailPort(value int32) error ``` ## Default Value 25 ## Remarks This property contains the server port for SMTP (default 25). A valid port number (a value between 1 and 65535) is required for the connection to take place. The property must be set before a connection is attempted and cannot be changed once a connection is established. Any attempt to change this property while connected will fail with an error. For an implicit Secure Sockets Layer (SSL), use port 465 (please refer to the [SSLStartMode](#sslstartmode-property-smtp-component) property for more information). ## Data Type **int32** # MailServer Property ([SMTP](#smtp-component) Component) This property includes the name or address of a mail server (mail relay). ## Syntax *Go Syntax* ```text func (obj *SMTP) MailServer() (string, error)func (obj *SMTP) SetMailServer(value string) error ``` ## Default Value "" ## Remarks This property specifies the IP address (IP number in dotted internet format) or domain name for a mail relay through which messages will be routed. It is set before a connection is attempted and cannot be changed once a connection is in progress. The current version of the struct does not provide a default value for the mail relay. You must provide a host name yourself. Generally, any internet host with an SMTP server will suffice (e.g., a UNIX host), but it is preferable to select a MailServer that is close to the machine sending mail. If this property is set to a domain name, a DNS request is initiated. Upon successful termination of the request, this property is set to the corresponding address. If the search is not successful, an error is returned. If the struct is configured to use a *SOCKS* firewall, the value assigned to this property may be preceded with an "*". If this is the case, the host name is passed to the firewall unresolved and the firewall performs the DNS resolution. ## Data Type **string** # Message Property ([SMTP](#smtp-component) Component) This property provides a way to set the raw message content. ## Syntax *Go Syntax* ```text func (obj *SMTP) Message() ([]byte, error)func (obj *SMTP) SetMessage(value []byte) error ``` ## Default Value "" ## Remarks This property may be set instead of [MessageText](#messagetext-property-smtp-component). This value will not be modified in any way by the struct and will be sent as is. Use caution when setting this value as all encoding must be done before supplying the value to the component. ## Data Type **[]byte** # MessageDate Property ([SMTP](#smtp-component) Component) This property includes the date of the mail message (optional). ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageDate() (string, error)func (obj *SMTP) SetMessageDate(value string) error ``` ## Default Value "*" ## Remarks If this property contains a nonempty string, then a *Date* SMTP header is created and attached to the message. If it is an empty string, then the date information is added by the mail relay(s) the message goes through. Special case: If this property is set to the special value "*", a *Date* SMTP header reflecting the current date and time is generated when MessageHeaders is computed and the message is sent. This is the default behavior of the struct RFC 822 contains detailed date format specifications. An example of a valid date is "Fri, 1 Mar 96 21:24:52 EST". ## Data Type **string** # MessageHeaderCount Property ([SMTP](#smtp-component) Component) The number of records in the MessageHeader arrays. ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageHeaderCount() (int32, error) ``` ## Default Value 0 ## Remarks This property controls the size of the following arrays: - [MessageHeaderField](#messageheaderfield-property-smtp-component) - [MessageHeaderValue](#messageheadervalue-property-smtp-component) The array indices start at *0* and end at *MessageHeaderCount - 1*. This property is read-only. ## Data Type **int32** # MessageHeaderField Property ([SMTP](#smtp-component) Component) This property contains the name of the HTTP header (this is the same case as it is delivered). ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageHeaderField(MessageHeaderIndex int32) (string, error) ``` ## Default Value "" ## Remarks This property contains the name of the HTTP [Header](#Type_Header) (this is the same case as it is delivered). The *MessageHeaderIndex* parameter specifies the index of the item in the array. The size of the array is controlled by the [MessageHeaderCount](#messageheadercount-property-smtp-component) property. This property is read-only. ## Data Type **string** # MessageHeaderValue Property ([SMTP](#smtp-component) Component) This property contains the header contents. ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageHeaderValue(MessageHeaderIndex int32) (string, error) ``` ## Default Value "" ## Remarks This property contains the [Header](#Type_Header) contents. The *MessageHeaderIndex* parameter specifies the index of the item in the array. The size of the array is controlled by the [MessageHeaderCount](#messageheadercount-property-smtp-component) property. This property is read-only. ## Data Type **string** # MessageHeadersString Property ([SMTP](#smtp-component) Component) This property includes the string representation of RFC 822-encoded headers of the message. ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageHeadersString() (string, error) ``` ## Default Value "" ## Remarks This property holds the full headers of the message in RFC 822 format. This property is read-only. ## Data Type **string** # MessageId Property ([SMTP](#smtp-component) Component) This property includes the message identifier for the message. ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageId() (string, error)func (obj *SMTP) SetMessageId(value string) error ``` ## Default Value "*" ## Remarks This property contains the message identifier for the message. When set, the value of MessageId is used as the Message-Id header value of the message. A special value of "*" will automatically generate a random unique identifier for the message. ## Data Type **string** # MessageRecipientCount Property ([SMTP](#smtp-component) Component) The number of records in the MessageRecipient arrays. ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageRecipientCount() (int32, error)func (obj *SMTP) SetMessageRecipientCount(value int32) error ``` ## Default Value 0 ## Remarks This property controls the size of the following arrays: - [MessageRecipientAddress](#messagerecipientaddress-property-smtp-component) - [MessageRecipientName](#messagerecipientname-property-smtp-component) - [MessageRecipientOptions](#messagerecipientoptions-property-smtp-component) - [MessageRecipientType](#messagerecipienttype-property-smtp-component) The array indices start at *0* and end at *MessageRecipientCount - 1*. ## Data Type **int32** # MessageRecipientAddress Property ([SMTP](#smtp-component) Component) This property contains the email address of the recipient. ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageRecipientAddress(RecipientIndex int32) (string, error)func (obj *SMTP) SetMessageRecipientAddress(RecipientIndex int32, value string) error ``` ## Default Value "" ## Remarks This property contains the email address of the recipient. The *RecipientIndex* parameter specifies the index of the item in the array. The size of the array is controlled by the [MessageRecipientCount](#messagerecipientcount-property-smtp-component) property. ## Data Type **string** # MessageRecipientName Property ([SMTP](#smtp-component) Component) This property contains the name of the recipient. ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageRecipientName(RecipientIndex int32) (string, error)func (obj *SMTP) SetMessageRecipientName(RecipientIndex int32, value string) error ``` ## Default Value "" ## Remarks This property contains the name of the recipient. The *RecipientIndex* parameter specifies the index of the item in the array. The size of the array is controlled by the [MessageRecipientCount](#messagerecipientcount-property-smtp-component) property. ## Data Type **string** # MessageRecipientOptions Property ([SMTP](#smtp-component) Component) This property contains the recipient sending options (used only by SMTP). ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageRecipientOptions(RecipientIndex int32) (string, error)func (obj *SMTP) SetMessageRecipientOptions(RecipientIndex int32, value string) error ``` ## Default Value "" ## Remarks This property contains the recipient sending options (used only by SMTP). This must be a string of RFC-compliant recipient options (used by [SMTP](#smtp-component)). One type of option is a delivery status notification sent per recipient, which is specified by RFC 1891. ```text component.MessageRecipientOptions(0) = "NOTIFY SUCCESS,FAILURE,DELAY"; ``` The *RecipientIndex* parameter specifies the index of the item in the array. The size of the array is controlled by the [MessageRecipientCount](#messagerecipientcount-property-smtp-component) property. ## Data Type **string** # MessageRecipientType Property ([SMTP](#smtp-component) Component) This property contains the recipient type: To, Cc, or Bcc. ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageRecipientType(RecipientIndex int32) (int32, error)func (obj *SMTP) SetMessageRecipientType(RecipientIndex int32, value int32) error ``` ## Possible Values ```text 0 // To1 // Cc2 // BCc ``` ## Default Value 0 ## Remarks This property contains the recipient type: To, Cc, or Bcc. The *RecipientIndex* parameter specifies the index of the item in the array. The size of the array is controlled by the [MessageRecipientCount](#messagerecipientcount-property-smtp-component) property. ## Data Type **int32** # MessageText Property ([SMTP](#smtp-component) Component) This property includes the full text of the message to send (without headers). ## Syntax *Go Syntax* ```text func (obj *SMTP) MessageText() (string, error)func (obj *SMTP) SetMessageText(value string) error ``` ## Default Value "" ## Remarks This property contains the full text of the message. The text contained in this property should be a collection of lines with lengths less than or equal to 80 bytes separated by CRLF (*"\r\n"*) . The text in the message lines must contain 7-bit characters so that the message can successfully pass through the multitude of mail systems on the Internet. The struct automatically escapes lines that start with a "." by adding another as specified in RFC 821. The message text is unescaped by the receiving agent, so the process is fully transparent. ## Data Type **string** # OAuthAccessToken Property ([SMTP](#smtp-component) Component) The access token returned by the authorization server. ## Syntax *Go Syntax* ```text func (obj *SMTP) OAuthAccessToken() (string, error)func (obj *SMTP) SetOAuthAccessToken(value string) error ``` ## Default Value "" ## Remarks The access token returned by the authorization server. This is set when the struct makes a request to the token server. ## Data Type **string** # OAuthAuthorizationScope Property ([SMTP](#smtp-component) Component) The scope request or response parameter used during authorization. ## Syntax *Go Syntax* ```text func (obj *SMTP) OAuthAuthorizationScope() (string, error)func (obj *SMTP) SetOAuthAuthorizationScope(value string) error ``` ## Default Value "" ## Remarks The scope request or response parameter used during authorization. ## Data Type **string** # OAuthClientId Property ([SMTP](#smtp-component) Component) The id of the client assigned when registering the application. ## Syntax *Go Syntax* ```text func (obj *SMTP) OAuthClientId() (string, error)func (obj *SMTP) SetOAuthClientId(value string) error ``` ## Default Value "" ## Remarks The id of the client assigned when registering the application. ## Data Type **string** # OAuthClientSecret Property ([SMTP](#smtp-component) Component) The secret value for the client assigned when registering the application. ## Syntax *Go Syntax* ```text func (obj *SMTP) OAuthClientSecret() (string, error)func (obj *SMTP) SetOAuthClientSecret(value string) error ``` ## Default Value "" ## Remarks The secret value for the client assigned when registering the application. ## Data Type **string** # OAuthRefreshToken Property ([SMTP](#smtp-component) Component) Specifies the refresh token received from or sent to the authorization server. ## Syntax *Go Syntax* ```text func (obj *SMTP) OAuthRefreshToken() (string, error)func (obj *SMTP) SetOAuthRefreshToken(value string) error ``` ## Default Value "" ## Remarks Specifies the refresh token received from or sent to the authorization server. This property is set automatically if a refresh token is retrieved from the token server. If the OAuthAutomaticRefresh configuration setting is set to true, and the OAuthGrantType property is set to a grant that can use refresh tokens. ## Data Type **string** # OAuthReturnURL Property ([SMTP](#smtp-component) Component) The URL where the user (browser) returns after authenticating. ## Syntax *Go Syntax* ```text func (obj *SMTP) OAuthReturnURL() (string, error)func (obj *SMTP) SetOAuthReturnURL(value string) error ``` ## Default Value "" ## Remarks The URL where the user (browser) returns after authenticating. This property is mapped to the *redirect_uri* parameter when making a request to the authorization server. Typically, this is automatically set by the struct when using the embedded web server. If the OAuthWebServerPort or OAuthWebServerHost configuration settings is set, then this property should be set to match. If using the Web client profile, this should be set to the place where the authorization code will be parsed out of the response after the user finishes authorizing. ## Data Type **string** # OAuthServerAuthURL Property ([SMTP](#smtp-component) Component) The URL of the authorization server. ## Syntax *Go Syntax* ```text func (obj *SMTP) OAuthServerAuthURL() (string, error)func (obj *SMTP) SetOAuthServerAuthURL(value string) error ``` ## Default Value "" ## Remarks The URL of the authorization server. ## Data Type **string** # OAuthServerTokenURL Property ([SMTP](#smtp-component) Component) The URL of the token server used to obtain the access token. ## Syntax *Go Syntax* ```text func (obj *SMTP) OAuthServerTokenURL() (string, error)func (obj *SMTP) SetOAuthServerTokenURL(value string) error ``` ## Default Value "" ## Remarks The URL of the token server used to obtain the access token. ## Data Type **string** # OtherHeaders Property ([SMTP](#smtp-component) Component) This property includes an RFC 822-compliant string consisting of extra headers. ## Syntax *Go Syntax* ```text func (obj *SMTP) OtherHeaders() (string, error)func (obj *SMTP) SetOtherHeaders(value string) error ``` ## Default Value "" ## Remarks This property contains a string of headers to be appended to the message headers created from other properties like [SendTo](#sendto-property-smtp-component), [Subject](#subject-property-smtp-component), and so on. The headers must be of the format "header: value" as specified in RFC 822. Header lines should be separated by CRLF (*"\r\n"*) . Use this property with caution. If this property contains invalid headers, message delivery might not be successful. This property is useful for extending the functionality of the struct. A good example is delivery of MIME-encoded messages. Special case: If this property starts with an empty line (CRLF), then the value of this property is used instead of the normally computed message headers. **Example. Sending an Email with an Additional Header:** ```text component.MailServer = "MyServer"; component.From = "me@server.com"; component.SendTo = "recipient@server.com"; component.Subject = "My Subject"; component.MessageText = "This is the message body."; component.OtherHeaders = "HeaderName: HeaderValue"; component.Send(); ``` ## Data Type **string** # Password Property ([SMTP](#smtp-component) Component) This property includes a password for logon to the MailServer . ## Syntax *Go Syntax* ```text func (obj *SMTP) Password() (string, error)func (obj *SMTP) SetPassword(value string) error ``` ## Default Value "" ## Remarks If this property is set to a nonempty string, then when connecting to the [MailServer](#mailserver-property-smtp-component) an AUTH or CRAM-MD5 (depending on the value of [AuthMechanism](#authmechanism-property-smtp-component)) command is sent to provide authentication information for the user. ## Data Type **string** # Priority Property ([SMTP](#smtp-component) Component) This property includes the priority of the mail message (optional). ## Syntax *Go Syntax* ```text func (obj *SMTP) Priority() (int32, error)func (obj *SMTP) SetPriority(value int32) error ``` ## Possible Values ```text 0 // Unspecified1 // Normal2 // Urgent3 // NonUrgent ``` ## Default Value 0 ## Remarks When this property is set, a priority header will be added to the message. Priority is an indication about the delivery priority of the message. The possible values are epNormal, epUrgent, and epNonUrgent. ## Data Type **int32** # ReadReceiptTo Property ([SMTP](#smtp-component) Component) This property includes the email address to send a read-receipt to. ## Syntax *Go Syntax* ```text func (obj *SMTP) ReadReceiptTo() (string, error)func (obj *SMTP) SetReadReceiptTo(value string) error ``` ## Default Value "" ## Remarks When this property is set, a Disposition-Notification-To header is added to the message. This property should be set to an email address that should receive the read-receipt. ## Data Type **string** # ReplyTo Property ([SMTP](#smtp-component) Component) This property includes a mail address to which to reply (optional). ## Syntax *Go Syntax* ```text func (obj *SMTP) ReplyTo() (string, error)func (obj *SMTP) SetReplyTo(value string) error ``` ## Default Value "" ## Remarks If this property contains a nonempty string, a *Reply-To* SMTP header is created for the message. This header shows the address to use for replies, which is useful if this address is different from the one in [From](#from-property-smtp-component). If the resulting header is longer than [MaxHeaderLength](#MaxHeaderLength), then it is folded according to RFC 822 specifications. ## Data Type **string** # ReturnPath Property ([SMTP](#smtp-component) Component) This property sets the Return-Path to be used for sending email. ## Syntax *Go Syntax* ```text func (obj *SMTP) ReturnPath() (string, error)func (obj *SMTP) SetReturnPath(value string) error ``` ## Default Value "" ## Remarks Setting this property sets the Return-Path to be used for sending email. If this is not set, the value in the [From](#from-property-smtp-component) property is used. ## Data Type **string** # SendTo Property ([SMTP](#smtp-component) Component) This property includes a comma-separated list of addresses for destinations (required). ## Syntax *Go Syntax* ```text func (obj *SMTP) SendTo() (string, error)func (obj *SMTP) SetSendTo(value string) error ``` ## Default Value "" ## Remarks This property specifies a comma-separated list of destinations for the mail message. A copy of the message is sent to each of them, and a *To* SMTP header is created containing the destination addresses. Examples of valid addresses are as follows: *"Friendly Name" * or *address@company.com* The struct will fail if the [MailServer](#mailserver-property-smtp-component) returns an error code about any email address specified in *SendTo* or [Cc](#cc-property-smtp-component) but it will silently ignore the error if the same thing happens with an email address specified in [BCc](#bcc-property-smtp-component). If the resulting header is longer than [MaxHeaderLength](#MaxHeaderLength), then it is folded according to RFC 822 specifications. NOTE: You must clear the MessageRecipients properties before setting this property to remove previous recipients. ## Data Type **string** # Sensitivity Property ([SMTP](#smtp-component) Component) This property indicates the sensitivity of the mail message (optional). ## Syntax *Go Syntax* ```text func (obj *SMTP) Sensitivity() (int32, error)func (obj *SMTP) SetSensitivity(value int32) error ``` ## Possible Values ```text 0 // Unspecified1 // Personal2 // Private3 // CompanyConfidential ``` ## Default Value 0 ## Remarks This property provides an indication of how sensitive it is to disclose the message to people other than the recipients of the message. When set, a Sensitivity header will added to the message. Possible values are as follows: esPersonal (1), esPrivate (2), and esCompanyConfidential (3). ## Data Type **int32** # SSLAcceptServerCertEffectiveDate Property ([SMTP](#smtp-component) Component) The date on which this certificate becomes valid. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertEffectiveDate() (string, error) ``` ## Default Value "" ## Remarks The date on which this certificate becomes valid. Before this date, it is not valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date: 23-Jan-2000 15:00:00. This property is read-only. ## Data Type **string** # SSLAcceptServerCertExpirationDate Property ([SMTP](#smtp-component) Component) The date on which the certificate expires. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertExpirationDate() (string, error) ``` ## Default Value "" ## Remarks The date on which the certificate expires. After this date, the certificate will no longer be valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date: 23-Jan-2001 15:00:00. This property is read-only. ## Data Type **string** # SSLAcceptServerCertExtendedKeyUsage Property ([SMTP](#smtp-component) Component) A comma-delimited list of extended key usage identifiers. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertExtendedKeyUsage() (string, error) ``` ## Default Value "" ## Remarks A comma-delimited list of extended key usage identifiers. These are the same as ASN.1 object identifiers (OIDs). This property is read-only. ## Data Type **string** # SSLAcceptServerCertFingerprint Property ([SMTP](#smtp-component) Component) The hex-encoded, 16-byte MD5 fingerprint of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertFingerprint() (string, error) ``` ## Default Value "" ## Remarks The hex-encoded, 16-byte MD5 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys. The following example illustrates the format: *bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02* This property is read-only. ## Data Type **string** # SSLAcceptServerCertFingerprintSHA1 Property ([SMTP](#smtp-component) Component) The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertFingerprintSHA1() (string, error) ``` ## Default Value "" ## Remarks The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys. The following example illustrates the format: *30:7b:fa:38:65:83:ff:da:b4:4e:07:3f:17:b8:a4:ed:80:be:ff:84* This property is read-only. ## Data Type **string** # SSLAcceptServerCertFingerprintSHA256 Property ([SMTP](#smtp-component) Component) The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertFingerprintSHA256() (string, error) ``` ## Default Value "" ## Remarks The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys. The following example illustrates the format: *6a:80:5c:33:a9:43:ea:b0:96:12:8a:64:96:30:ef:4a:8a:96:86:ce:f4:c7:be:10:24:8e:2b:60:9e:f3:59:53* This property is read-only. ## Data Type **string** # SSLAcceptServerCertIssuer Property ([SMTP](#smtp-component) Component) The issuer of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertIssuer() (string, error) ``` ## Default Value "" ## Remarks The issuer of the certificate. This property contains a string representation of the name of the issuing authority for the certificate. This property is read-only. ## Data Type **string** # SSLAcceptServerCertPrivateKey Property ([SMTP](#smtp-component) Component) The private key of the certificate (if available). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertPrivateKey() (string, error) ``` ## Default Value "" ## Remarks The private key of the certificate (if available). The key is provided as PEM/Base64-encoded data. NOTE: The [SSLAcceptServerCertPrivateKey](#sslacceptservercertprivatekey-property-smtp-component) may be available but not exportable. In this case, [SSLAcceptServerCertPrivateKey](#sslacceptservercertprivatekey-property-smtp-component) returns an empty string. This property is read-only. ## Data Type **string** # SSLAcceptServerCertPrivateKeyAvailable Property ([SMTP](#smtp-component) Component) Whether a PrivateKey is available for the selected certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertPrivateKeyAvailable() (bool, error) ``` ## Default Value false ## Remarks Whether a [SSLAcceptServerCertPrivateKey](#sslacceptservercertprivatekey-property-smtp-component) is available for the selected certificate. If [SSLAcceptServerCertPrivateKeyAvailable](#sslacceptservercertprivatekeyavailable-property-smtp-component) is True, the certificate may be used for authentication purposes (e.g., server authentication). This property is read-only. ## Data Type **bool** # SSLAcceptServerCertPrivateKeyContainer Property ([SMTP](#smtp-component) Component) The name of the PrivateKey container for the certificate (if available). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertPrivateKeyContainer() (string, error) ``` ## Default Value "" ## Remarks The name of the [SSLAcceptServerCertPrivateKey](#sslacceptservercertprivatekey-property-smtp-component) container for the certificate (if available). This functionality is available only on Windows platforms. This property is read-only. ## Data Type **string** # SSLAcceptServerCertPublicKey Property ([SMTP](#smtp-component) Component) The public key of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertPublicKey() (string, error) ``` ## Default Value "" ## Remarks The public key of the certificate. The key is provided as PEM/Base64-encoded data. This property is read-only. ## Data Type **string** # SSLAcceptServerCertPublicKeyAlgorithm Property ([SMTP](#smtp-component) Component) The textual description of the certificate's public key algorithm. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertPublicKeyAlgorithm() (string, error) ``` ## Default Value "" ## Remarks The textual description of the certificate's public key algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_DH") or an object identifier (OID) string representing the algorithm. This property is read-only. ## Data Type **string** # SSLAcceptServerCertPublicKeyLength Property ([SMTP](#smtp-component) Component) The length of the certificate's public key (in bits). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertPublicKeyLength() (int32, error) ``` ## Default Value 0 ## Remarks The length of the certificate's public key (in bits). Common values are 512, 1024, and 2048. This property is read-only. ## Data Type **int32** # SSLAcceptServerCertSerialNumber Property ([SMTP](#smtp-component) Component) The serial number of the certificate encoded as a string. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertSerialNumber() (string, error) ``` ## Default Value "" ## Remarks The serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, with each pair representing a byte of the serial number. This property is read-only. ## Data Type **string** # SSLAcceptServerCertSignatureAlgorithm Property ([SMTP](#smtp-component) Component) The text description of the certificate's signature algorithm. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertSignatureAlgorithm() (string, error) ``` ## Default Value "" ## Remarks The text description of the certificate's signature algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_MD5RSA") or an object identifier (OID) string representing the algorithm. This property is read-only. ## Data Type **string** # SSLAcceptServerCertStore Property ([SMTP](#smtp-component) Component) The name of the certificate store for the client certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertStore() ([]byte, error)func (obj *SMTP) SetSSLAcceptServerCertStore(value []byte) error ``` ## Default Value "MY" ## Remarks The name of the certificate store for the client certificate. The [SSLAcceptServerCertStoreType](#sslacceptservercertstoretype-property-smtp-component) property denotes the type of the certificate store specified by [SSLAcceptServerCertStore](#sslacceptservercertstore-property-smtp-component). If the store is password-protected, specify the password in [SSLAcceptServerCertStorePassword](#sslacceptservercertstorepassword-property-smtp-component). [SSLAcceptServerCertStore](#sslacceptservercertstore-property-smtp-component) is used in conjunction with the [SSLAcceptServerCertSubject](#sslacceptservercertsubject-property-smtp-component) property to specify client certificates. If [SSLAcceptServerCertStore](#sslacceptservercertstore-property-smtp-component) has a value, and [SSLAcceptServerCertSubject](#sslacceptservercertsubject-property-smtp-component) or [SSLAcceptServerCertEncoded](#sslacceptservercertencoded-property-smtp-component) is set, a search for a certificate is initiated. Please see the [SSLAcceptServerCertSubject](#sslacceptservercertsubject-property-smtp-component) property for details. Designations of certificate stores are platform dependent. The following designations are the most common User and Machine certificate stores in Windows: | | | | --- | --- | | MY | A certificate store holding personal certificates with their associated private keys. | | CA | Certifying authority certificates. | | ROOT | Root certificates. | When the certificate store type is *cstPFXFile*, this property must be set to the name of the file. When the type is *cstPFXBlob*, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store). ## Data Type **[]byte** # SSLAcceptServerCertStorePassword Property ([SMTP](#smtp-component) Component) If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertStorePassword() (string, error)func (obj *SMTP) SetSSLAcceptServerCertStorePassword(value string) error ``` ## Default Value "" ## Remarks If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store. ## Data Type **string** # SSLAcceptServerCertStoreType Property ([SMTP](#smtp-component) Component) The type of certificate store for this certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertStoreType() (int32, error)func (obj *SMTP) SetSSLAcceptServerCertStoreType(value int32) error ``` ## Possible Values ```text 0 // User1 // Machine2 // PFXFile3 // PFXBlob4 // JKSFile5 // JKSBlob6 // PEMKeyFile7 // PEMKeyBlob8 // PublicKeyFile9 // PublicKeyBlob10 // SSHPublicKeyBlob11 // P7BFile12 // P7BBlob13 // SSHPublicKeyFile14 // PPKFile15 // PPKBlob16 // XMLFile17 // XMLBlob18 // JWKFile19 // JWKBlob20 // SecurityKey21 // BCFKSFile22 // BCFKSBlob23 // PKCS1199 // Auto ``` ## Default Value 0 ## Remarks The type of certificate store for this certificate. The struct supports both public and private keys in a variety of formats. When the *cstAuto* value is used, the struct will automatically determine the type. This property can take one of the following values: ```csharp sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11, @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll", "123456", // PIN "CN=cert_subject"); sftp.SSHUser = "test"; sftp.SSHLogon("myhost", 22); ``` ```csharp certmgr.CertStoreType = CertStoreTypes.cstPKCS11; certmgr.OnCertList += (s, e) => { secKeyBlob = e.CertEncoded; }; certmgr.CertStore = @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll"; certmgr.CertStorePassword = "123456"; // PIN certmgr.ListStoreCertificates(); sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11, secKeyBlob, "123456", "*"); sftp.SSHUser = "test"; sftp.SSHLogon("myhost", 22); ``` | | | | --- | --- | | 0 (cstUser - default) | For Windows, this specifies that the certificate store is a certificate store owned by the current user. NOTE: This store type is not available in Java. | | 1 (cstMachine) | For Windows, this specifies that the certificate store is a machine store. NOTE: This store type is not available in Java. | | 2 (cstPFXFile) | The certificate store is the name of a PFX (PKCS#12) file containing certificates. | | 3 (cstPFXBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in PFX (PKCS#12) format. | | 4 (cstJKSFile) | The certificate store is the name of a Java Key Store (JKS) file containing certificates. NOTE: This store type is only available in Java. | | 5 (cstJKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in Java Key Store (JKS) format. NOTE: This store type is only available in Java. | | 6 (cstPEMKeyFile) | The certificate store is the name of a PEM-encoded file that contains a private key and an optional certificate. | | 7 (cstPEMKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a private key and an optional certificate. | | 8 (cstPublicKeyFile) | The certificate store is the name of a file that contains a PEM- or DER-encoded public key certificate. | | 9 (cstPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a PEM- or DER-encoded public key certificate. | | 10 (cstSSHPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains an SSH-style public key. | | 11 (cstP7BFile) | The certificate store is the name of a PKCS#7 file containing certificates. | | 12 (cstP7BBlob) | The certificate store is a string (binary) representing a certificate store in PKCS#7 format. | | 13 (cstSSHPublicKeyFile) | The certificate store is the name of a file that contains an SSH-style public key. | | 14 (cstPPKFile) | The certificate store is the name of a file that contains a PPK (PuTTY Private Key). | | 15 (cstPPKBlob) | The certificate store is a string (binary) that contains a PPK (PuTTY Private Key). | | 16 (cstXMLFile) | The certificate store is the name of a file that contains a certificate in XML format. | | 17 (cstXMLBlob) | The certificate store is a string that contains a certificate in XML format. | | 18 (cstJWKFile) | The certificate store is the name of a file that contains a JWK (JSON Web Key). | | 19 (cstJWKBlob) | The certificate store is a string that contains a JWK (JSON Web Key). | | 21 (cstBCFKSFile) | The certificate store is the name of a file that contains a BCFKS (Bouncy Castle FIPS Key Store). NOTE: This store type is only available in Java and .NET. | | 22 (cstBCFKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in BCFKS (Bouncy Castle FIPS Key Store) format. NOTE: This store type is only available in Java and .NET. | | 23 (cstPKCS11) | The certificate is present on a physical security key accessible via a PKCS#11 interface. To use a security key, create a new [Certificate](#Type_Certificate) object and pass cstPKCS11 as the [SSLAcceptServerCertStoreType](#sslacceptservercertstoretype-property-smtp-component), the full path of the PKCS#11 DLL as the [SSLAcceptServerCertStore](#sslacceptservercertstore-property-smtp-component), and the PIN as the [SSLAcceptServerCertStorePassword](#sslacceptservercertstorepassword-property-smtp-component). Code Example. SSH Authentication with Security Key (without CertMgr): Alternatively, collect the necessary data using the [CertMgr](#CertMgr) struct by calling the [ListStoreCertificates](#CertMgr_m_ListStoreCertificates) method after setting the corresponding properties accordingly. The certificate information returned in the [CertList](#CertMgr_e_CertList) event's CertEncoded parameter may be saved for later use. When using a certificate obtained with this approach, pass the previously saved security key information as the [SSLAcceptServerCertStore](#sslacceptservercertstore-property-smtp-component) and set [SSLAcceptServerCertStorePassword](#sslacceptservercertstorepassword-property-smtp-component) to the PIN. Code Example. SSH Authentication with Security Key (with CertMgr): | | 99 (cstAuto) | The store type is automatically detected from the input data. This setting may be used with both public and private keys and can detect any of the supported formats automatically. | ## Data Type **int32** # SSLAcceptServerCertSubjectAltNames Property ([SMTP](#smtp-component) Component) Comma-separated lists of alternative subject names for the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertSubjectAltNames() (string, error) ``` ## Default Value "" ## Remarks Comma-separated lists of alternative subject names for the certificate. This property is read-only. ## Data Type **string** # SSLAcceptServerCertThumbprintMD5 Property ([SMTP](#smtp-component) Component) The MD5 hash of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertThumbprintMD5() (string, error) ``` ## Default Value "" ## Remarks The MD5 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed. This property is read-only. ## Data Type **string** # SSLAcceptServerCertThumbprintSHA1 Property ([SMTP](#smtp-component) Component) The SHA-1 hash of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertThumbprintSHA1() (string, error) ``` ## Default Value "" ## Remarks The SHA-1 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed. This property is read-only. ## Data Type **string** # SSLAcceptServerCertThumbprintSHA256 Property ([SMTP](#smtp-component) Component) The SHA-256 hash of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertThumbprintSHA256() (string, error) ``` ## Default Value "" ## Remarks The SHA-256 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed. This property is read-only. ## Data Type **string** # SSLAcceptServerCertUsage Property ([SMTP](#smtp-component) Component) The text description of UsageFlags . ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertUsage() (string, error) ``` ## Default Value "" ## Remarks The text description of [SSLAcceptServerCertUsageFlags](#sslacceptservercertusageflags-property-smtp-component). This value will be one or more of the following strings and will be separated by commas: - Digital Signature - Non-Repudiation - Key Encipherment - Data Encipherment - Key Agreement - Certificate Signing - CRL Signing - Encipher Only If the provider is OpenSSL, the value is a comma-separated list of X.509 certificate extension names. This property is read-only. ## Data Type **string** # SSLAcceptServerCertUsageFlags Property ([SMTP](#smtp-component) Component) The flags that show intended use for the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertUsageFlags() (int32, error) ``` ## Default Value 0 ## Remarks The flags that show intended use for the certificate. The value of [SSLAcceptServerCertUsageFlags](#sslacceptservercertusageflags-property-smtp-component) is a combination of the following flags: | | | | --- | --- | | 0x80 | Digital Signature | | 0x40 | Non-Repudiation | | 0x20 | Key Encipherment | | 0x10 | Data Encipherment | | 0x08 | Key Agreement | | 0x04 | Certificate Signing | | 0x02 | CRL Signing | | 0x01 | Encipher Only | Please see the [SSLAcceptServerCertUsage](#sslacceptservercertusage-property-smtp-component) property for a text representation of [SSLAcceptServerCertUsageFlags](#sslacceptservercertusageflags-property-smtp-component). This functionality currently is not available when the provider is OpenSSL. This property is read-only. ## Data Type **int32** # SSLAcceptServerCertVersion Property ([SMTP](#smtp-component) Component) The certificate's version number. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertVersion() (string, error) ``` ## Default Value "" ## Remarks The certificate's version number. The possible values are the strings "V1", "V2", and "V3". This property is read-only. ## Data Type **string** # SSLAcceptServerCertSubject Property ([SMTP](#smtp-component) Component) The subject of the certificate used for client authentication. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertSubject() (string, error)func (obj *SMTP) SetSSLAcceptServerCertSubject(value string) error ``` ## Default Value "" ## Remarks The subject of the certificate used for client authentication. This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject. If a matching certificate is found, the property is set to the full subject of the matching certificate. If an exact match is not found, the store is searched for subjects containing the value of the property. If a match is still not found, the property is set to an empty string, and no certificate is selected. The special value "*" picks a random certificate in the certificate store. The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=example@email.com". Common fields and their meanings are as follows: | Field | Meaning | | --- | --- | | CN | Common Name. This is commonly a hostname like www.server.com. | | O | Organization | | OU | Organizational Unit | | L | Locality | | S | State | | C | Country | | E | Email Address | If a field value contains a comma, it must be quoted. ## Data Type **string** # SSLAcceptServerCertEncoded Property ([SMTP](#smtp-component) Component) The certificate (PEM/Base64 encoded). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLAcceptServerCertEncoded() ([]byte, error)func (obj *SMTP) SetSSLAcceptServerCertEncoded(value []byte) error ``` ## Default Value "" ## Remarks The certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The [SSLAcceptServerCertStore](#sslacceptservercertstore-property-smtp-component) and [SSLAcceptServerCertSubject](#sslacceptservercertsubject-property-smtp-component) properties also may be used to specify a certificate. When [SSLAcceptServerCertEncoded](#sslacceptservercertencoded-property-smtp-component) is set, a search is initiated in the current [SSLAcceptServerCertStore](#sslacceptservercertstore-property-smtp-component) for the private key of the certificate. If the key is found, [SSLAcceptServerCertSubject](#sslacceptservercertsubject-property-smtp-component) is updated to reflect the full subject of the selected certificate; otherwise, [SSLAcceptServerCertSubject](#sslacceptservercertsubject-property-smtp-component) is set to an empty string. ## Data Type **[]byte** # SSLCertEffectiveDate Property ([SMTP](#smtp-component) Component) The date on which this certificate becomes valid. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertEffectiveDate() (string, error) ``` ## Default Value "" ## Remarks The date on which this certificate becomes valid. Before this date, it is not valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date: 23-Jan-2000 15:00:00. This property is read-only. ## Data Type **string** # SSLCertExpirationDate Property ([SMTP](#smtp-component) Component) The date on which the certificate expires. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertExpirationDate() (string, error) ``` ## Default Value "" ## Remarks The date on which the certificate expires. After this date, the certificate will no longer be valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date: 23-Jan-2001 15:00:00. This property is read-only. ## Data Type **string** # SSLCertExtendedKeyUsage Property ([SMTP](#smtp-component) Component) A comma-delimited list of extended key usage identifiers. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertExtendedKeyUsage() (string, error) ``` ## Default Value "" ## Remarks A comma-delimited list of extended key usage identifiers. These are the same as ASN.1 object identifiers (OIDs). This property is read-only. ## Data Type **string** # SSLCertFingerprint Property ([SMTP](#smtp-component) Component) The hex-encoded, 16-byte MD5 fingerprint of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertFingerprint() (string, error) ``` ## Default Value "" ## Remarks The hex-encoded, 16-byte MD5 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys. The following example illustrates the format: *bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02* This property is read-only. ## Data Type **string** # SSLCertFingerprintSHA1 Property ([SMTP](#smtp-component) Component) The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertFingerprintSHA1() (string, error) ``` ## Default Value "" ## Remarks The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys. The following example illustrates the format: *30:7b:fa:38:65:83:ff:da:b4:4e:07:3f:17:b8:a4:ed:80:be:ff:84* This property is read-only. ## Data Type **string** # SSLCertFingerprintSHA256 Property ([SMTP](#smtp-component) Component) The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertFingerprintSHA256() (string, error) ``` ## Default Value "" ## Remarks The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys. The following example illustrates the format: *6a:80:5c:33:a9:43:ea:b0:96:12:8a:64:96:30:ef:4a:8a:96:86:ce:f4:c7:be:10:24:8e:2b:60:9e:f3:59:53* This property is read-only. ## Data Type **string** # SSLCertIssuer Property ([SMTP](#smtp-component) Component) The issuer of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertIssuer() (string, error) ``` ## Default Value "" ## Remarks The issuer of the certificate. This property contains a string representation of the name of the issuing authority for the certificate. This property is read-only. ## Data Type **string** # SSLCertPrivateKey Property ([SMTP](#smtp-component) Component) The private key of the certificate (if available). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertPrivateKey() (string, error) ``` ## Default Value "" ## Remarks The private key of the certificate (if available). The key is provided as PEM/Base64-encoded data. NOTE: The [SSLCertPrivateKey](#sslcertprivatekey-property-smtp-component) may be available but not exportable. In this case, [SSLCertPrivateKey](#sslcertprivatekey-property-smtp-component) returns an empty string. This property is read-only. ## Data Type **string** # SSLCertPrivateKeyAvailable Property ([SMTP](#smtp-component) Component) Whether a PrivateKey is available for the selected certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertPrivateKeyAvailable() (bool, error) ``` ## Default Value false ## Remarks Whether a [SSLCertPrivateKey](#sslcertprivatekey-property-smtp-component) is available for the selected certificate. If [SSLCertPrivateKeyAvailable](#sslcertprivatekeyavailable-property-smtp-component) is True, the certificate may be used for authentication purposes (e.g., server authentication). This property is read-only. ## Data Type **bool** # SSLCertPrivateKeyContainer Property ([SMTP](#smtp-component) Component) The name of the PrivateKey container for the certificate (if available). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertPrivateKeyContainer() (string, error) ``` ## Default Value "" ## Remarks The name of the [SSLCertPrivateKey](#sslcertprivatekey-property-smtp-component) container for the certificate (if available). This functionality is available only on Windows platforms. This property is read-only. ## Data Type **string** # SSLCertPublicKey Property ([SMTP](#smtp-component) Component) The public key of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertPublicKey() (string, error) ``` ## Default Value "" ## Remarks The public key of the certificate. The key is provided as PEM/Base64-encoded data. This property is read-only. ## Data Type **string** # SSLCertPublicKeyAlgorithm Property ([SMTP](#smtp-component) Component) The textual description of the certificate's public key algorithm. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertPublicKeyAlgorithm() (string, error) ``` ## Default Value "" ## Remarks The textual description of the certificate's public key algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_DH") or an object identifier (OID) string representing the algorithm. This property is read-only. ## Data Type **string** # SSLCertPublicKeyLength Property ([SMTP](#smtp-component) Component) The length of the certificate's public key (in bits). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertPublicKeyLength() (int32, error) ``` ## Default Value 0 ## Remarks The length of the certificate's public key (in bits). Common values are 512, 1024, and 2048. This property is read-only. ## Data Type **int32** # SSLCertSerialNumber Property ([SMTP](#smtp-component) Component) The serial number of the certificate encoded as a string. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertSerialNumber() (string, error) ``` ## Default Value "" ## Remarks The serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, with each pair representing a byte of the serial number. This property is read-only. ## Data Type **string** # SSLCertSignatureAlgorithm Property ([SMTP](#smtp-component) Component) The text description of the certificate's signature algorithm. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertSignatureAlgorithm() (string, error) ``` ## Default Value "" ## Remarks The text description of the certificate's signature algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_MD5RSA") or an object identifier (OID) string representing the algorithm. This property is read-only. ## Data Type **string** # SSLCertStore Property ([SMTP](#smtp-component) Component) The name of the certificate store for the client certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertStore() ([]byte, error)func (obj *SMTP) SetSSLCertStore(value []byte) error ``` ## Default Value "MY" ## Remarks The name of the certificate store for the client certificate. The [SSLCertStoreType](#sslcertstoretype-property-smtp-component) property denotes the type of the certificate store specified by [SSLCertStore](#sslcertstore-property-smtp-component). If the store is password-protected, specify the password in [SSLCertStorePassword](#sslcertstorepassword-property-smtp-component). [SSLCertStore](#sslcertstore-property-smtp-component) is used in conjunction with the [SSLCertSubject](#sslcertsubject-property-smtp-component) property to specify client certificates. If [SSLCertStore](#sslcertstore-property-smtp-component) has a value, and [SSLCertSubject](#sslcertsubject-property-smtp-component) or [SSLCertEncoded](#sslcertencoded-property-smtp-component) is set, a search for a certificate is initiated. Please see the [SSLCertSubject](#sslcertsubject-property-smtp-component) property for details. Designations of certificate stores are platform dependent. The following designations are the most common User and Machine certificate stores in Windows: | | | | --- | --- | | MY | A certificate store holding personal certificates with their associated private keys. | | CA | Certifying authority certificates. | | ROOT | Root certificates. | When the certificate store type is *cstPFXFile*, this property must be set to the name of the file. When the type is *cstPFXBlob*, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store). ## Data Type **[]byte** # SSLCertStorePassword Property ([SMTP](#smtp-component) Component) If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertStorePassword() (string, error)func (obj *SMTP) SetSSLCertStorePassword(value string) error ``` ## Default Value "" ## Remarks If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store. ## Data Type **string** # SSLCertStoreType Property ([SMTP](#smtp-component) Component) The type of certificate store for this certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertStoreType() (int32, error)func (obj *SMTP) SetSSLCertStoreType(value int32) error ``` ## Possible Values ```text 0 // User1 // Machine2 // PFXFile3 // PFXBlob4 // JKSFile5 // JKSBlob6 // PEMKeyFile7 // PEMKeyBlob8 // PublicKeyFile9 // PublicKeyBlob10 // SSHPublicKeyBlob11 // P7BFile12 // P7BBlob13 // SSHPublicKeyFile14 // PPKFile15 // PPKBlob16 // XMLFile17 // XMLBlob18 // JWKFile19 // JWKBlob20 // SecurityKey21 // BCFKSFile22 // BCFKSBlob23 // PKCS1199 // Auto ``` ## Default Value 0 ## Remarks The type of certificate store for this certificate. The struct supports both public and private keys in a variety of formats. When the *cstAuto* value is used, the struct will automatically determine the type. This property can take one of the following values: ```csharp sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11, @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll", "123456", // PIN "CN=cert_subject"); sftp.SSHUser = "test"; sftp.SSHLogon("myhost", 22); ``` ```csharp certmgr.CertStoreType = CertStoreTypes.cstPKCS11; certmgr.OnCertList += (s, e) => { secKeyBlob = e.CertEncoded; }; certmgr.CertStore = @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll"; certmgr.CertStorePassword = "123456"; // PIN certmgr.ListStoreCertificates(); sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11, secKeyBlob, "123456", "*"); sftp.SSHUser = "test"; sftp.SSHLogon("myhost", 22); ``` | | | | --- | --- | | 0 (cstUser - default) | For Windows, this specifies that the certificate store is a certificate store owned by the current user. NOTE: This store type is not available in Java. | | 1 (cstMachine) | For Windows, this specifies that the certificate store is a machine store. NOTE: This store type is not available in Java. | | 2 (cstPFXFile) | The certificate store is the name of a PFX (PKCS#12) file containing certificates. | | 3 (cstPFXBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in PFX (PKCS#12) format. | | 4 (cstJKSFile) | The certificate store is the name of a Java Key Store (JKS) file containing certificates. NOTE: This store type is only available in Java. | | 5 (cstJKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in Java Key Store (JKS) format. NOTE: This store type is only available in Java. | | 6 (cstPEMKeyFile) | The certificate store is the name of a PEM-encoded file that contains a private key and an optional certificate. | | 7 (cstPEMKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a private key and an optional certificate. | | 8 (cstPublicKeyFile) | The certificate store is the name of a file that contains a PEM- or DER-encoded public key certificate. | | 9 (cstPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a PEM- or DER-encoded public key certificate. | | 10 (cstSSHPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains an SSH-style public key. | | 11 (cstP7BFile) | The certificate store is the name of a PKCS#7 file containing certificates. | | 12 (cstP7BBlob) | The certificate store is a string (binary) representing a certificate store in PKCS#7 format. | | 13 (cstSSHPublicKeyFile) | The certificate store is the name of a file that contains an SSH-style public key. | | 14 (cstPPKFile) | The certificate store is the name of a file that contains a PPK (PuTTY Private Key). | | 15 (cstPPKBlob) | The certificate store is a string (binary) that contains a PPK (PuTTY Private Key). | | 16 (cstXMLFile) | The certificate store is the name of a file that contains a certificate in XML format. | | 17 (cstXMLBlob) | The certificate store is a string that contains a certificate in XML format. | | 18 (cstJWKFile) | The certificate store is the name of a file that contains a JWK (JSON Web Key). | | 19 (cstJWKBlob) | The certificate store is a string that contains a JWK (JSON Web Key). | | 21 (cstBCFKSFile) | The certificate store is the name of a file that contains a BCFKS (Bouncy Castle FIPS Key Store). NOTE: This store type is only available in Java and .NET. | | 22 (cstBCFKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in BCFKS (Bouncy Castle FIPS Key Store) format. NOTE: This store type is only available in Java and .NET. | | 23 (cstPKCS11) | The certificate is present on a physical security key accessible via a PKCS#11 interface. To use a security key, create a new [Certificate](#Type_Certificate) object and pass cstPKCS11 as the [SSLCertStoreType](#sslcertstoretype-property-smtp-component), the full path of the PKCS#11 DLL as the [SSLCertStore](#sslcertstore-property-smtp-component), and the PIN as the [SSLCertStorePassword](#sslcertstorepassword-property-smtp-component). Code Example. SSH Authentication with Security Key (without CertMgr): Alternatively, collect the necessary data using the [CertMgr](#CertMgr) struct by calling the [ListStoreCertificates](#CertMgr_m_ListStoreCertificates) method after setting the corresponding properties accordingly. The certificate information returned in the [CertList](#CertMgr_e_CertList) event's CertEncoded parameter may be saved for later use. When using a certificate obtained with this approach, pass the previously saved security key information as the [SSLCertStore](#sslcertstore-property-smtp-component) and set [SSLCertStorePassword](#sslcertstorepassword-property-smtp-component) to the PIN. Code Example. SSH Authentication with Security Key (with CertMgr): | | 99 (cstAuto) | The store type is automatically detected from the input data. This setting may be used with both public and private keys and can detect any of the supported formats automatically. | ## Data Type **int32** # SSLCertSubjectAltNames Property ([SMTP](#smtp-component) Component) Comma-separated lists of alternative subject names for the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertSubjectAltNames() (string, error) ``` ## Default Value "" ## Remarks Comma-separated lists of alternative subject names for the certificate. This property is read-only. ## Data Type **string** # SSLCertThumbprintMD5 Property ([SMTP](#smtp-component) Component) The MD5 hash of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertThumbprintMD5() (string, error) ``` ## Default Value "" ## Remarks The MD5 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed. This property is read-only. ## Data Type **string** # SSLCertThumbprintSHA1 Property ([SMTP](#smtp-component) Component) The SHA-1 hash of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertThumbprintSHA1() (string, error) ``` ## Default Value "" ## Remarks The SHA-1 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed. This property is read-only. ## Data Type **string** # SSLCertThumbprintSHA256 Property ([SMTP](#smtp-component) Component) The SHA-256 hash of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertThumbprintSHA256() (string, error) ``` ## Default Value "" ## Remarks The SHA-256 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed. This property is read-only. ## Data Type **string** # SSLCertUsage Property ([SMTP](#smtp-component) Component) The text description of UsageFlags . ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertUsage() (string, error) ``` ## Default Value "" ## Remarks The text description of [SSLCertUsageFlags](#sslcertusageflags-property-smtp-component). This value will be one or more of the following strings and will be separated by commas: - Digital Signature - Non-Repudiation - Key Encipherment - Data Encipherment - Key Agreement - Certificate Signing - CRL Signing - Encipher Only If the provider is OpenSSL, the value is a comma-separated list of X.509 certificate extension names. This property is read-only. ## Data Type **string** # SSLCertUsageFlags Property ([SMTP](#smtp-component) Component) The flags that show intended use for the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertUsageFlags() (int32, error) ``` ## Default Value 0 ## Remarks The flags that show intended use for the certificate. The value of [SSLCertUsageFlags](#sslcertusageflags-property-smtp-component) is a combination of the following flags: | | | | --- | --- | | 0x80 | Digital Signature | | 0x40 | Non-Repudiation | | 0x20 | Key Encipherment | | 0x10 | Data Encipherment | | 0x08 | Key Agreement | | 0x04 | Certificate Signing | | 0x02 | CRL Signing | | 0x01 | Encipher Only | Please see the [SSLCertUsage](#sslcertusage-property-smtp-component) property for a text representation of [SSLCertUsageFlags](#sslcertusageflags-property-smtp-component). This functionality currently is not available when the provider is OpenSSL. This property is read-only. ## Data Type **int32** # SSLCertVersion Property ([SMTP](#smtp-component) Component) The certificate's version number. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertVersion() (string, error) ``` ## Default Value "" ## Remarks The certificate's version number. The possible values are the strings "V1", "V2", and "V3". This property is read-only. ## Data Type **string** # SSLCertSubject Property ([SMTP](#smtp-component) Component) The subject of the certificate used for client authentication. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertSubject() (string, error)func (obj *SMTP) SetSSLCertSubject(value string) error ``` ## Default Value "" ## Remarks The subject of the certificate used for client authentication. This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject. If a matching certificate is found, the property is set to the full subject of the matching certificate. If an exact match is not found, the store is searched for subjects containing the value of the property. If a match is still not found, the property is set to an empty string, and no certificate is selected. The special value "*" picks a random certificate in the certificate store. The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=example@email.com". Common fields and their meanings are as follows: | Field | Meaning | | --- | --- | | CN | Common Name. This is commonly a hostname like www.server.com. | | O | Organization | | OU | Organizational Unit | | L | Locality | | S | State | | C | Country | | E | Email Address | If a field value contains a comma, it must be quoted. ## Data Type **string** # SSLCertEncoded Property ([SMTP](#smtp-component) Component) The certificate (PEM/Base64 encoded). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLCertEncoded() ([]byte, error)func (obj *SMTP) SetSSLCertEncoded(value []byte) error ``` ## Default Value "" ## Remarks The certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The [SSLCertStore](#sslcertstore-property-smtp-component) and [SSLCertSubject](#sslcertsubject-property-smtp-component) properties also may be used to specify a certificate. When [SSLCertEncoded](#sslcertencoded-property-smtp-component) is set, a search is initiated in the current [SSLCertStore](#sslcertstore-property-smtp-component) for the private key of the certificate. If the key is found, [SSLCertSubject](#sslcertsubject-property-smtp-component) is updated to reflect the full subject of the selected certificate; otherwise, [SSLCertSubject](#sslcertsubject-property-smtp-component) is set to an empty string. ## Data Type **[]byte** # SSLEnabled Property ([SMTP](#smtp-component) Component) This property indicates whether Transport Layer Security/Secure Sockets Layer (TLS/SSL) is enabled. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLEnabled() (bool, error)func (obj *SMTP) SetSSLEnabled(value bool) error ``` ## Default Value false ## Remarks This property specifies whether TLS/SSL is enabled in the struct. When False (default), the struct operates in plaintext mode. When True, TLS/SSL is enabled. TLS/SSL may also be enabled by setting [SSLStartMode](#sslstartmode-property-smtp-component). Setting [SSLStartMode](#sslstartmode-property-smtp-component) will automatically update this property value. ## Data Type **bool** # SSLProvider Property ([SMTP](#smtp-component) Component) The Secure Sockets Layer/Transport Layer Security (SSL/TLS) implementation to use. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLProvider() (int32, error)func (obj *SMTP) SetSSLProvider(value int32) error ``` ## Possible Values ```text 0 // Automatic1 // Platform2 // Internal ``` ## Default Value 0 ## Remarks This property specifies the SSL/TLS implementation to use. In most cases the default value of *0* (Automatic) is recommended and should not be changed. When set to *0* (Automatic), the struct will select whether to use the platform implementation or the internal implementation depending on the operating system as well as the TLS version being used. Possible values are as follows: | | | | --- | --- | | 0 (sslpAutomatic - default) | Automatically selects the appropriate implementation. | | 1 (sslpPlatform) | Uses the platform/system implementation. | | 2 (sslpInternal) | Uses the internal implementation. | **Additional Notes** In most cases using the default value (Automatic) is recommended. The struct will select a provider depending on the current platform. When Automatic is selected, on Windows, the struct will use the platform implementation. On Linux/macOS, the struct will use the internal implementation. When TLS 1.3 is enabled via [SSLEnabledProtocols](#SSLEnabledProtocols), the struct will always try and use the platform implementation. If the platform TLS 1.3 implementation is not available, the internal implementation will be used. ## Data Type **int32** # SSLServerCertEffectiveDate Property ([SMTP](#smtp-component) Component) The date on which this certificate becomes valid. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertEffectiveDate() (string, error) ``` ## Default Value "" ## Remarks The date on which this certificate becomes valid. Before this date, it is not valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date: 23-Jan-2000 15:00:00. This property is read-only. ## Data Type **string** # SSLServerCertExpirationDate Property ([SMTP](#smtp-component) Component) The date on which the certificate expires. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertExpirationDate() (string, error) ``` ## Default Value "" ## Remarks The date on which the certificate expires. After this date, the certificate will no longer be valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date: 23-Jan-2001 15:00:00. This property is read-only. ## Data Type **string** # SSLServerCertExtendedKeyUsage Property ([SMTP](#smtp-component) Component) A comma-delimited list of extended key usage identifiers. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertExtendedKeyUsage() (string, error) ``` ## Default Value "" ## Remarks A comma-delimited list of extended key usage identifiers. These are the same as ASN.1 object identifiers (OIDs). This property is read-only. ## Data Type **string** # SSLServerCertFingerprint Property ([SMTP](#smtp-component) Component) The hex-encoded, 16-byte MD5 fingerprint of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertFingerprint() (string, error) ``` ## Default Value "" ## Remarks The hex-encoded, 16-byte MD5 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys. The following example illustrates the format: *bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02* This property is read-only. ## Data Type **string** # SSLServerCertFingerprintSHA1 Property ([SMTP](#smtp-component) Component) The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertFingerprintSHA1() (string, error) ``` ## Default Value "" ## Remarks The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys. The following example illustrates the format: *30:7b:fa:38:65:83:ff:da:b4:4e:07:3f:17:b8:a4:ed:80:be:ff:84* This property is read-only. ## Data Type **string** # SSLServerCertFingerprintSHA256 Property ([SMTP](#smtp-component) Component) The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertFingerprintSHA256() (string, error) ``` ## Default Value "" ## Remarks The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys. The following example illustrates the format: *6a:80:5c:33:a9:43:ea:b0:96:12:8a:64:96:30:ef:4a:8a:96:86:ce:f4:c7:be:10:24:8e:2b:60:9e:f3:59:53* This property is read-only. ## Data Type **string** # SSLServerCertIssuer Property ([SMTP](#smtp-component) Component) The issuer of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertIssuer() (string, error) ``` ## Default Value "" ## Remarks The issuer of the certificate. This property contains a string representation of the name of the issuing authority for the certificate. This property is read-only. ## Data Type **string** # SSLServerCertPrivateKey Property ([SMTP](#smtp-component) Component) The private key of the certificate (if available). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertPrivateKey() (string, error) ``` ## Default Value "" ## Remarks The private key of the certificate (if available). The key is provided as PEM/Base64-encoded data. NOTE: The [SSLServerCertPrivateKey](#sslservercertprivatekey-property-smtp-component) may be available but not exportable. In this case, [SSLServerCertPrivateKey](#sslservercertprivatekey-property-smtp-component) returns an empty string. This property is read-only. ## Data Type **string** # SSLServerCertPrivateKeyAvailable Property ([SMTP](#smtp-component) Component) Whether a PrivateKey is available for the selected certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertPrivateKeyAvailable() (bool, error) ``` ## Default Value false ## Remarks Whether a [SSLServerCertPrivateKey](#sslservercertprivatekey-property-smtp-component) is available for the selected certificate. If [SSLServerCertPrivateKeyAvailable](#sslservercertprivatekeyavailable-property-smtp-component) is True, the certificate may be used for authentication purposes (e.g., server authentication). This property is read-only. ## Data Type **bool** # SSLServerCertPrivateKeyContainer Property ([SMTP](#smtp-component) Component) The name of the PrivateKey container for the certificate (if available). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertPrivateKeyContainer() (string, error) ``` ## Default Value "" ## Remarks The name of the [SSLServerCertPrivateKey](#sslservercertprivatekey-property-smtp-component) container for the certificate (if available). This functionality is available only on Windows platforms. This property is read-only. ## Data Type **string** # SSLServerCertPublicKey Property ([SMTP](#smtp-component) Component) The public key of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertPublicKey() (string, error) ``` ## Default Value "" ## Remarks The public key of the certificate. The key is provided as PEM/Base64-encoded data. This property is read-only. ## Data Type **string** # SSLServerCertPublicKeyAlgorithm Property ([SMTP](#smtp-component) Component) The textual description of the certificate's public key algorithm. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertPublicKeyAlgorithm() (string, error) ``` ## Default Value "" ## Remarks The textual description of the certificate's public key algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_DH") or an object identifier (OID) string representing the algorithm. This property is read-only. ## Data Type **string** # SSLServerCertPublicKeyLength Property ([SMTP](#smtp-component) Component) The length of the certificate's public key (in bits). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertPublicKeyLength() (int32, error) ``` ## Default Value 0 ## Remarks The length of the certificate's public key (in bits). Common values are 512, 1024, and 2048. This property is read-only. ## Data Type **int32** # SSLServerCertSerialNumber Property ([SMTP](#smtp-component) Component) The serial number of the certificate encoded as a string. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertSerialNumber() (string, error) ``` ## Default Value "" ## Remarks The serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, with each pair representing a byte of the serial number. This property is read-only. ## Data Type **string** # SSLServerCertSignatureAlgorithm Property ([SMTP](#smtp-component) Component) The text description of the certificate's signature algorithm. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertSignatureAlgorithm() (string, error) ``` ## Default Value "" ## Remarks The text description of the certificate's signature algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_MD5RSA") or an object identifier (OID) string representing the algorithm. This property is read-only. ## Data Type **string** # SSLServerCertStore Property ([SMTP](#smtp-component) Component) The name of the certificate store for the client certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertStore() ([]byte, error) ``` ## Default Value "MY" ## Remarks The name of the certificate store for the client certificate. The [SSLServerCertStoreType](#sslservercertstoretype-property-smtp-component) property denotes the type of the certificate store specified by [SSLServerCertStore](#sslservercertstore-property-smtp-component). If the store is password-protected, specify the password in [SSLServerCertStorePassword](#sslservercertstorepassword-property-smtp-component). [SSLServerCertStore](#sslservercertstore-property-smtp-component) is used in conjunction with the [SSLServerCertSubject](#sslservercertsubject-property-smtp-component) property to specify client certificates. If [SSLServerCertStore](#sslservercertstore-property-smtp-component) has a value, and [SSLServerCertSubject](#sslservercertsubject-property-smtp-component) or [SSLServerCertEncoded](#sslservercertencoded-property-smtp-component) is set, a search for a certificate is initiated. Please see the [SSLServerCertSubject](#sslservercertsubject-property-smtp-component) property for details. Designations of certificate stores are platform dependent. The following designations are the most common User and Machine certificate stores in Windows: | | | | --- | --- | | MY | A certificate store holding personal certificates with their associated private keys. | | CA | Certifying authority certificates. | | ROOT | Root certificates. | When the certificate store type is *cstPFXFile*, this property must be set to the name of the file. When the type is *cstPFXBlob*, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store). This property is read-only. ## Data Type **[]byte** # SSLServerCertStorePassword Property ([SMTP](#smtp-component) Component) If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertStorePassword() (string, error) ``` ## Default Value "" ## Remarks If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store. This property is read-only. ## Data Type **string** # SSLServerCertStoreType Property ([SMTP](#smtp-component) Component) The type of certificate store for this certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertStoreType() (int32, error) ``` ## Possible Values ```text 0 // User1 // Machine2 // PFXFile3 // PFXBlob4 // JKSFile5 // JKSBlob6 // PEMKeyFile7 // PEMKeyBlob8 // PublicKeyFile9 // PublicKeyBlob10 // SSHPublicKeyBlob11 // P7BFile12 // P7BBlob13 // SSHPublicKeyFile14 // PPKFile15 // PPKBlob16 // XMLFile17 // XMLBlob18 // JWKFile19 // JWKBlob20 // SecurityKey21 // BCFKSFile22 // BCFKSBlob23 // PKCS1199 // Auto ``` ## Default Value 0 ## Remarks The type of certificate store for this certificate. The struct supports both public and private keys in a variety of formats. When the *cstAuto* value is used, the struct will automatically determine the type. This property can take one of the following values: ```csharp sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11, @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll", "123456", // PIN "CN=cert_subject"); sftp.SSHUser = "test"; sftp.SSHLogon("myhost", 22); ``` ```csharp certmgr.CertStoreType = CertStoreTypes.cstPKCS11; certmgr.OnCertList += (s, e) => { secKeyBlob = e.CertEncoded; }; certmgr.CertStore = @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll"; certmgr.CertStorePassword = "123456"; // PIN certmgr.ListStoreCertificates(); sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11, secKeyBlob, "123456", "*"); sftp.SSHUser = "test"; sftp.SSHLogon("myhost", 22); ``` | | | | --- | --- | | 0 (cstUser - default) | For Windows, this specifies that the certificate store is a certificate store owned by the current user. NOTE: This store type is not available in Java. | | 1 (cstMachine) | For Windows, this specifies that the certificate store is a machine store. NOTE: This store type is not available in Java. | | 2 (cstPFXFile) | The certificate store is the name of a PFX (PKCS#12) file containing certificates. | | 3 (cstPFXBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in PFX (PKCS#12) format. | | 4 (cstJKSFile) | The certificate store is the name of a Java Key Store (JKS) file containing certificates. NOTE: This store type is only available in Java. | | 5 (cstJKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in Java Key Store (JKS) format. NOTE: This store type is only available in Java. | | 6 (cstPEMKeyFile) | The certificate store is the name of a PEM-encoded file that contains a private key and an optional certificate. | | 7 (cstPEMKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a private key and an optional certificate. | | 8 (cstPublicKeyFile) | The certificate store is the name of a file that contains a PEM- or DER-encoded public key certificate. | | 9 (cstPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a PEM- or DER-encoded public key certificate. | | 10 (cstSSHPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains an SSH-style public key. | | 11 (cstP7BFile) | The certificate store is the name of a PKCS#7 file containing certificates. | | 12 (cstP7BBlob) | The certificate store is a string (binary) representing a certificate store in PKCS#7 format. | | 13 (cstSSHPublicKeyFile) | The certificate store is the name of a file that contains an SSH-style public key. | | 14 (cstPPKFile) | The certificate store is the name of a file that contains a PPK (PuTTY Private Key). | | 15 (cstPPKBlob) | The certificate store is a string (binary) that contains a PPK (PuTTY Private Key). | | 16 (cstXMLFile) | The certificate store is the name of a file that contains a certificate in XML format. | | 17 (cstXMLBlob) | The certificate store is a string that contains a certificate in XML format. | | 18 (cstJWKFile) | The certificate store is the name of a file that contains a JWK (JSON Web Key). | | 19 (cstJWKBlob) | The certificate store is a string that contains a JWK (JSON Web Key). | | 21 (cstBCFKSFile) | The certificate store is the name of a file that contains a BCFKS (Bouncy Castle FIPS Key Store). NOTE: This store type is only available in Java and .NET. | | 22 (cstBCFKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in BCFKS (Bouncy Castle FIPS Key Store) format. NOTE: This store type is only available in Java and .NET. | | 23 (cstPKCS11) | The certificate is present on a physical security key accessible via a PKCS#11 interface. To use a security key, create a new [Certificate](#Type_Certificate) object and pass cstPKCS11 as the [SSLServerCertStoreType](#sslservercertstoretype-property-smtp-component), the full path of the PKCS#11 DLL as the [SSLServerCertStore](#sslservercertstore-property-smtp-component), and the PIN as the [SSLServerCertStorePassword](#sslservercertstorepassword-property-smtp-component). Code Example. SSH Authentication with Security Key (without CertMgr): Alternatively, collect the necessary data using the [CertMgr](#CertMgr) struct by calling the [ListStoreCertificates](#CertMgr_m_ListStoreCertificates) method after setting the corresponding properties accordingly. The certificate information returned in the [CertList](#CertMgr_e_CertList) event's CertEncoded parameter may be saved for later use. When using a certificate obtained with this approach, pass the previously saved security key information as the [SSLServerCertStore](#sslservercertstore-property-smtp-component) and set [SSLServerCertStorePassword](#sslservercertstorepassword-property-smtp-component) to the PIN. Code Example. SSH Authentication with Security Key (with CertMgr): | | 99 (cstAuto) | The store type is automatically detected from the input data. This setting may be used with both public and private keys and can detect any of the supported formats automatically. | This property is read-only. ## Data Type **int32** # SSLServerCertSubjectAltNames Property ([SMTP](#smtp-component) Component) Comma-separated lists of alternative subject names for the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertSubjectAltNames() (string, error) ``` ## Default Value "" ## Remarks Comma-separated lists of alternative subject names for the certificate. This property is read-only. ## Data Type **string** # SSLServerCertThumbprintMD5 Property ([SMTP](#smtp-component) Component) The MD5 hash of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertThumbprintMD5() (string, error) ``` ## Default Value "" ## Remarks The MD5 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed. This property is read-only. ## Data Type **string** # SSLServerCertThumbprintSHA1 Property ([SMTP](#smtp-component) Component) The SHA-1 hash of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertThumbprintSHA1() (string, error) ``` ## Default Value "" ## Remarks The SHA-1 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed. This property is read-only. ## Data Type **string** # SSLServerCertThumbprintSHA256 Property ([SMTP](#smtp-component) Component) The SHA-256 hash of the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertThumbprintSHA256() (string, error) ``` ## Default Value "" ## Remarks The SHA-256 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed. This property is read-only. ## Data Type **string** # SSLServerCertUsage Property ([SMTP](#smtp-component) Component) The text description of UsageFlags . ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertUsage() (string, error) ``` ## Default Value "" ## Remarks The text description of [SSLServerCertUsageFlags](#sslservercertusageflags-property-smtp-component). This value will be one or more of the following strings and will be separated by commas: - Digital Signature - Non-Repudiation - Key Encipherment - Data Encipherment - Key Agreement - Certificate Signing - CRL Signing - Encipher Only If the provider is OpenSSL, the value is a comma-separated list of X.509 certificate extension names. This property is read-only. ## Data Type **string** # SSLServerCertUsageFlags Property ([SMTP](#smtp-component) Component) The flags that show intended use for the certificate. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertUsageFlags() (int32, error) ``` ## Default Value 0 ## Remarks The flags that show intended use for the certificate. The value of [SSLServerCertUsageFlags](#sslservercertusageflags-property-smtp-component) is a combination of the following flags: | | | | --- | --- | | 0x80 | Digital Signature | | 0x40 | Non-Repudiation | | 0x20 | Key Encipherment | | 0x10 | Data Encipherment | | 0x08 | Key Agreement | | 0x04 | Certificate Signing | | 0x02 | CRL Signing | | 0x01 | Encipher Only | Please see the [SSLServerCertUsage](#sslservercertusage-property-smtp-component) property for a text representation of [SSLServerCertUsageFlags](#sslservercertusageflags-property-smtp-component). This functionality currently is not available when the provider is OpenSSL. This property is read-only. ## Data Type **int32** # SSLServerCertVersion Property ([SMTP](#smtp-component) Component) The certificate's version number. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertVersion() (string, error) ``` ## Default Value "" ## Remarks The certificate's version number. The possible values are the strings "V1", "V2", and "V3". This property is read-only. ## Data Type **string** # SSLServerCertSubject Property ([SMTP](#smtp-component) Component) The subject of the certificate used for client authentication. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertSubject() (string, error) ``` ## Default Value "" ## Remarks The subject of the certificate used for client authentication. This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject. If a matching certificate is found, the property is set to the full subject of the matching certificate. If an exact match is not found, the store is searched for subjects containing the value of the property. If a match is still not found, the property is set to an empty string, and no certificate is selected. The special value "*" picks a random certificate in the certificate store. The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=example@email.com". Common fields and their meanings are as follows: | Field | Meaning | | --- | --- | | CN | Common Name. This is commonly a hostname like www.server.com. | | O | Organization | | OU | Organizational Unit | | L | Locality | | S | State | | C | Country | | E | Email Address | If a field value contains a comma, it must be quoted. This property is read-only. ## Data Type **string** # SSLServerCertEncoded Property ([SMTP](#smtp-component) Component) The certificate (PEM/Base64 encoded). ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLServerCertEncoded() ([]byte, error) ``` ## Default Value "" ## Remarks The certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The [SSLServerCertStore](#sslservercertstore-property-smtp-component) and [SSLServerCertSubject](#sslservercertsubject-property-smtp-component) properties also may be used to specify a certificate. When [SSLServerCertEncoded](#sslservercertencoded-property-smtp-component) is set, a search is initiated in the current [SSLServerCertStore](#sslservercertstore-property-smtp-component) for the private key of the certificate. If the key is found, [SSLServerCertSubject](#sslservercertsubject-property-smtp-component) is updated to reflect the full subject of the selected certificate; otherwise, [SSLServerCertSubject](#sslservercertsubject-property-smtp-component) is set to an empty string. This property is read-only. ## Data Type **[]byte** # SSLStartMode Property ([SMTP](#smtp-component) Component) This property determines how the class starts the Secure Sockets Layer (SSL) negotiation. ## Syntax *Go Syntax* ```text func (obj *SMTP) SSLStartMode() (int32, error)func (obj *SMTP) SetSSLStartMode(value int32) error ``` ## Possible Values ```text 0 // Automatic1 // Implicit2 // Explicit3 // None ``` ## Default Value 3 ## Remarks The SSLStartMode property may have one of the following values: | | | | --- | --- | | 0 (sslAutomatic) | If the remote port is set to the standard plaintext port of the protocol (where applicable), the struct will behave the same as if SSLStartMode is set to sslExplicit. In all other cases, SSL negotiation will be implicit (sslImplicit). | | 1 (sslImplicit) | The SSL negotiation will start immediately after the connection is established. | | 2 (sslExplicit) | The struct will first connect in plaintext, and then will explicitly start SSL negotiation through a protocol command such as STARTTLS. | | 3 (sslNone - default) | No SSL negotiation; no SSL security. All communication will be in plaintext mode. | ## Data Type **int32** # Subject Property ([SMTP](#smtp-component) Component) This property includes the subject of the mail message (optional). ## Syntax *Go Syntax* ```text func (obj *SMTP) Subject() (string, error)func (obj *SMTP) SetSubject(value string) error ``` ## Default Value "" ## Remarks The string in this property is sent with a *Subject* SMTP header to the mail recipient. If the resulting header is longer than [MaxHeaderLength](#MaxHeaderLength), then it is folded according to RFC 822 specifications. ## Data Type **string** # Timeout Property ([SMTP](#smtp-component) Component) The timeout for the class. ## Syntax *Go Syntax* ```text func (obj *SMTP) Timeout() (int32, error)func (obj *SMTP) SetTimeout(value int32) error ``` ## Default Value 60 ## Remarks If the Timeout property is set to 0, all operations will run uninterrupted until successful completion or an error condition is encountered. If Timeout is set to a positive value, the struct will wait for the operation to complete before returning control. The struct will use [DoEvents](#doevents-method-smtp-component) to enter an efficient wait loop during any potential waiting period, making sure that all system events are processed immediately as they arrive. This ensures that the host application does not freeze and remains responsive. If Timeout expires, and the operation is not yet complete, the struct fails with an error. NOTE: By default, all timeouts are *inactivity timeouts*, that is, the timeout period is extended by Timeout seconds when any amount of data is successfully sent or received. The default value for the Timeout property is 60 seconds. ## Data Type **int32** # User Property ([SMTP](#smtp-component) Component) This property includes the user identifier needed to log in as in the MailServer . ## Syntax *Go Syntax* ```text func (obj *SMTP) User() (string, error)func (obj *SMTP) SetUser(value string) error ``` ## Default Value "" ## Remarks If this property is set to a nonempty string, then when connecting to the [MailServer](#mailserver-property-smtp-component) an *AUTH* or *CRAM-MD5* (depending on the value of [AuthMechanism](#authmechanism-property-smtp-component)) command is sent to provide authentication information for the user. ## Data Type **string** # Config Method ([SMTP](#smtp-component) Component) Sets or retrieves a configuration setting. ## Syntax *Go Syntax* ```text func (obj *SMTP) Config(ConfigurationString string) (string, error) ``` ## Remarks Config is a generic method available in every struct. It is used to set and retrieve [configuration settings](#config-settings-smtp-component) for the struct. These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the struct, access to these *internal properties* is provided through the Config method. To set a configuration setting named *PROPERTY*, you must call *Config("PROPERTY=VALUE")*, where *VALUE* is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter). To read (query) the value of a [configuration setting](#config-settings-smtp-component), you must call *Config("PROPERTY")*. The value will be returned as a string. # Connect Method ([SMTP](#smtp-component) Component) This method connects to the mail relay and sends the SMTP HELO command. ## Syntax *Go Syntax* ```text func (obj *SMTP) Connect() error ``` ## Remarks This method connects to the mail relay and sends the SMTP *HELO* command, thus preparing to send messages. Any number of messages can later be sent using the [Send](#send-method-smtp-component) method. **Example. Connecting and Sending an Email:** ```text control.MailServer = "MyServer" control.From = "me@server.com" control.SendTo = "recipient@server.com" control.Subject = "My Subject" control.MessageText = "This is the message body" control.Connect() control.Send() control.Disconnect() ``` # Disconnect Method ([SMTP](#smtp-component) Component) This method disconnects from the SMTP server. ## Syntax *Go Syntax* ```text func (obj *SMTP) Disconnect() error ``` ## Remarks This method disconnects from the mail relay. # DoEvents Method ([SMTP](#smtp-component) Component) This method processes events from the internal message queue. ## Syntax *Go Syntax* ```text func (obj *SMTP) DoEvents() error ``` ## Remarks When DoEvents is called, the struct processes any available events. If no events are available, it waits for a preset period of time, and then returns. # Expand Method ([SMTP](#smtp-component) Component) This method asks the MailServer to expand a name or mailing list. ## Syntax *Go Syntax* ```text func (obj *SMTP) Expand(EmailAddress string) error ``` ## Remarks This method asks the [MailServer](#mailserver-property-smtp-component) to expand a name or mailing list. The resulting response is provided in one or more [Expand](#expand-event-smtp-component) events (one for each address). The struct will try to connect to the mail relay if it is not already connected. # Interrupt Method ([SMTP](#smtp-component) Component) This method interrupts the current method. ## Syntax *Go Syntax* ```text func (obj *SMTP) Interrupt() error ``` ## Remarks If there is no method in progress, Interrupt simply returns, doing nothing. # ProcessQueue Method ([SMTP](#smtp-component) Component) This method sends the messages that previously have been queued into QueueDir . ## Syntax *Go Syntax* ```text func (obj *SMTP) ProcessQueue(QueueDir string) error ``` ## Remarks This method sends the messages that previously have been queued into *QueueDir*. The [PITrail](#pitrail-event-smtp-component) event shows the interaction with the server as messages are processed. This method looks in the directory for files with the extension ".queued" and starts processing them. When processing starts, the file extension is changed to ".sending". If an error happens at this stage, the sending process is aborted, and the file extension is changed to ".failed". If the file is successfully sent, the file is normally deleted, unless the [KeepQueue](#KeepQueue) configuration setting is set to True, in which case the file extension is instead changed to ".sent" and the queue file is not deleted. # Queue Method ([SMTP](#smtp-component) Component) This method queues the message into QueueDir . ## Syntax *Go Syntax* ```text func (obj *SMTP) Queue(QueueDir string) (string, error) ``` ## Remarks This method queues the message into *QueueDir*. The message is queued into a unique file into the directory *QueueDir* for future processing. *QueueDir* must already exist, or an error will be generated. Alternatively, *QueueDir* may be set to "*" to return the result as a string instead of writing it to a file. This method returns the name of the unique queue file created in *QueueDir*. The file extension is ".queued". Please refer to the [ProcessQueue](#processqueue-method-smtp-component) method for more information on email queue processing. # Reset Method ([SMTP](#smtp-component) Component) This method will reset the class. ## Syntax *Go Syntax* ```text func (obj *SMTP) Reset() error ``` ## Remarks This method will reset the struct's properties to their default values. # ResetHeaders Method ([SMTP](#smtp-component) Component) This method resets all the message headers to empty. ## Syntax *Go Syntax* ```text func (obj *SMTP) ResetHeaders() error ``` ## Remarks This method resets all the message headers to "" (empty string). Use this method before creating a new message, so that headers from the previous message are not carried over to the next one. # Send Method ([SMTP](#smtp-component) Component) This method sends the current message. ## Syntax *Go Syntax* ```text func (obj *SMTP) Send() error ``` ## Remarks This method sends the current message. If the struct is not connected to the mail relay, a connection is created, the message is sent, and then the connection is closed unless an error occurs. If the struct is already connected (by use of the [Connect](#connect-method-smtp-component) method), the connection will remain open after the message is sent. To disconnect, call the [Disconnect](#disconnect-method-smtp-component) method. **Example. Send an Email:** ```text SMTPControl.MailServer = "MyServer" SMTPControl.From = "me@server.com" SMTPControl.SendTo = "recipient@server.com" SMTPControl.Subject = "My Subject" SMTPControl.MessageText = "This is the message body" SMTPControl.Send() ``` # SendCommand Method ([SMTP](#smtp-component) Component) This method sends the exact command directly to the server. ## Syntax *Go Syntax* ```text func (obj *SMTP) SendCommand(Command string) error ``` ## Remarks This method sends the command specified by *Command* to the server exactly as it is provided. Use this method to send additional or custom commands directly to the server. After calling this method, check the [LastReply](#lastreply-property-smtp-component) property or monitor the [PITrail](#pitrail-event-smtp-component) event to obtain the server's response. # SendToTerminalAndEmail Method ([SMTP](#smtp-component) Component) This method sends to terminal and email. ## Syntax *Go Syntax* ```text func (obj *SMTP) SendToTerminalAndEmail() error ``` ## Remarks This method is similar to [Send](#send-method-smtp-component) but requests also that the message is sent to the terminal of the users as well, if they are logged on and accept terminal messages. This method requires that [AllowExtensions](#allowextensions-property-smtp-component) is set to True and is not supported by all mail relays. # SendToTerminalOnly Method ([SMTP](#smtp-component) Component) This method sends to terminal only. ## Syntax *Go Syntax* ```text func (obj *SMTP) SendToTerminalOnly() error ``` ## Remarks This method is similar to *Send* but requests instead that the message is sent to the user's terminal. An error code with the server's response is returned if the user is not logged in or does not accept terminal messages. This method requires that [AllowExtensions](#allowextensions-property-smtp-component) is set to True and is not supported by all mail relays. # SendToTerminalOrEmail Method ([SMTP](#smtp-component) Component) This method sends to terminal or email. ## Syntax *Go Syntax* ```text func (obj *SMTP) SendToTerminalOrEmail() error ``` ## Remarks This method is similar to [Send](#send-method-smtp-component) but requests instead that the message is first sent to the user's terminal. If the user is not logged in or does not accept terminal messages, the message is sent to his or her mailbox. This method requires that [AllowExtensions](#allowextensions-property-smtp-component) is set to True and is not supported by all mail relays. # Verify Method ([SMTP](#smtp-component) Component) This method sends a verification request to the SMTP server. ## Syntax *Go Syntax* ```text func (obj *SMTP) Verify(EmailAddress string) error ``` ## Remarks This method asks the [MailServer](#mailserver-property-smtp-component) to verify the email address provided in the *'EmailAddress'* parameter. # ConnectionStatus Event ([SMTP](#smtp-component) Component) Fired to indicate changes in the connection state. ## Syntax *Go Syntax* ```text // SMTPConnectionStatusEventArgs carries the SMTP ConnectionStatus event's parameters. type SMTPConnectionStatusEventArgs struct {...} func (args *SMTPConnectionStatusEventArgs) ConnectionEvent() string func (args *SMTPConnectionStatusEventArgs) StatusCode() int32 func (args *SMTPConnectionStatusEventArgs) Description() string // SMTPConnectionStatusEvent defines the signature of the SMTP ConnectionStatus event's handler function. type SMTPConnectionStatusEvent func(sender *SMTP, args *SMTPConnectionStatusEventArgs) func (obj *SMTP) GetOnConnectionStatusHandler() SMTPConnectionStatusEvent func (obj *SMTP) SetOnConnectionStatusHandler(handlerFunc SMTPConnectionStatusEvent) ``` ## Remarks This event is fired when the connection state changes: for example, completion of a firewall or proxy connection or completion of a security handshake. The *ConnectionEvent* parameter indicates the type of connection event. Values may include the following: | | | | --- | --- | | | Firewall connection complete. | | | Secure Sockets Layer (SSL) or S/Shell handshake complete (where applicable). | | | Remote host connection complete. | | | Remote host disconnected. | | | SSL or S/Shell connection broken. | | | Firewall host disconnected. | *StatusCode* has the error code returned by the Transmission Control Protocol (TCP)/IP stack. *Description* contains a description of this code. The value of *StatusCode* is equal to the value of the error. # EndTransfer Event ([SMTP](#smtp-component) Component) This event is fired when the message text completes transferring. ## Syntax *Go Syntax* ```text // SMTPEndTransferEventArgs carries the SMTP EndTransfer event's parameters. type SMTPEndTransferEventArgs struct {...} func (args *SMTPEndTransferEventArgs) Direction() int32 // SMTPEndTransferEvent defines the signature of the SMTP EndTransfer event's handler function. type SMTPEndTransferEvent func(sender *SMTP, args *SMTPEndTransferEventArgs) func (obj *SMTP) GetOnEndTransferHandler() SMTPEndTransferEvent func (obj *SMTP) SetOnEndTransferHandler(handlerFunc SMTPEndTransferEvent) ``` ## Remarks If [MessageText](#messagetext-property-smtp-component) is not empty, the EndTransfer event is fired when the [MessageText](#messagetext-property-smtp-component) finishes transferring from the local host to the [MailServer](#mailserver-property-smtp-component). If [MessageText](#messagetext-property-smtp-component) is empty, the event is not fired. If a file is attached to the [MessageText](#messagetext-property-smtp-component) via the AttachedFile property, then EndTransfer fires again when the file finishes transferring. For more information, go to the description of the AttachedFile property. The *Direction* parameter shows whether the client (0) or the server (1) is sending the data. # Error Event ([SMTP](#smtp-component) Component) Fired when information is available about errors during data delivery. ## Syntax *Go Syntax* ```text // SMTPErrorEventArgs carries the SMTP Error event's parameters. type SMTPErrorEventArgs struct {...} func (args *SMTPErrorEventArgs) ErrorCode() int32 func (args *SMTPErrorEventArgs) Description() string // SMTPErrorEvent defines the signature of the SMTP Error event's handler function. type SMTPErrorEvent func(sender *SMTP, args *SMTPErrorEventArgs) func (obj *SMTP) GetOnErrorHandler() SMTPErrorEvent func (obj *SMTP) SetOnErrorHandler(handlerFunc SMTPErrorEvent) ``` ## Remarks The Error event is fired in case of exceptional conditions during message processing. Normally the struct fails with an error. The *ErrorCode* parameter contains an error code, and the *Description* parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the [Error Codes](#trappable-errors-smtp-component) section. # Expand Event ([SMTP](#smtp-component) Component) This event is fired for every email address returned by the server when the Expand method is called. ## Syntax *Go Syntax* ```text // SMTPExpandEventArgs carries the SMTP Expand event's parameters. type SMTPExpandEventArgs struct {...} func (args *SMTPExpandEventArgs) Address() string // SMTPExpandEvent defines the signature of the SMTP Expand event's handler function. type SMTPExpandEvent func(sender *SMTP, args *SMTPExpandEventArgs) func (obj *SMTP) GetOnExpandHandler() SMTPExpandEvent func (obj *SMTP) SetOnExpandHandler(handlerFunc SMTPExpandEvent) ``` ## Remarks This event is fired for every email address as returned by the mail server when the [Expand](#expand-method-smtp-component) method is called. The *Address* parameter may contain a name and an email address, or just an email address, suitable for any of the addressing properties. # LaunchBrowser Event ([SMTP](#smtp-component) Component) Fires before launching a browser with the authorization URL. ## Syntax *Go Syntax* ```text // SMTPLaunchBrowserEventArgs carries the SMTP LaunchBrowser event's parameters. type SMTPLaunchBrowserEventArgs struct {...} func (args *SMTPLaunchBrowserEventArgs) URL() string func (args *SMTPLaunchBrowserEventArgs) SetURL(value string) func (args *SMTPLaunchBrowserEventArgs) Command() string func (args *SMTPLaunchBrowserEventArgs) SetCommand(value string) // SMTPLaunchBrowserEvent defines the signature of the SMTP LaunchBrowser event's handler function. type SMTPLaunchBrowserEvent func(sender *SMTP, args *SMTPLaunchBrowserEventArgs) func (obj *SMTP) GetOnLaunchBrowserHandler() SMTPLaunchBrowserEvent func (obj *SMTP) SetOnLaunchBrowserHandler(handlerFunc SMTPLaunchBrowserEvent) ``` ## Remarks When the ClientProfile property is set to ocpApplication and GetAuthorization is called, the struct will fire this event with the *Command*, which will be executed by the struct. The *URL* parameter will be the authorization URL that the user will be directed to authenticate. Within this event, you may override the current value of either *Command* or *URL* and provide your own value. If *Command* is set to an empty string, the struct will not attempt to launch the browser and instead you will be responsible for directing the user to the authorization URL specified by the URL parameter. If *Command* is not empty, the URL will be appended to the end. In Windows, ShellExecute is used to execute *Command*, which limits the verbs available for use in *Command* to: - edit - explore - find - open - print # Log Event ([SMTP](#smtp-component) Component) Fired once for each log message. ## Syntax *Go Syntax* ```text // SMTPLogEventArgs carries the SMTP Log event's parameters. type SMTPLogEventArgs struct {...} func (args *SMTPLogEventArgs) LogLevel() int32 func (args *SMTPLogEventArgs) Message() string func (args *SMTPLogEventArgs) LogType() string // SMTPLogEvent defines the signature of the SMTP Log event's handler function. type SMTPLogEvent func(sender *SMTP, args *SMTPLogEventArgs) func (obj *SMTP) GetOnLogHandler() SMTPLogEvent func (obj *SMTP) SetOnLogHandler(handlerFunc SMTPLogEvent) ``` ## Remarks This event is fired once for each log message generated by the struct. The verbosity is controlled by the [LogLevel](#LogLevel) setting. *LogLevel* indicates the level of message. Possible values are as follows: | | | | --- | --- | | 0 (None) | No events are logged. | | 1 (Info - default) | Informational events are logged. | | 2 (Verbose) | Detailed data are logged. | | 3 (Debug) | Debug data are logged. | The value 1 (Info) logs basic information, including the URL, HTTP version, and status details. The value 2 (Verbose) logs additional information about the request and response. The value 3 (Debug) logs the headers and body for both the request and response, as well as additional debug information (if any). *Message* is the log entry. *LogType* identifies the type of log entry. Possible values are as follows: - "Info" - "RequestHeaders" - "ResponseHeaders" - "RequestBody" - "ResponseBody" - "ProxyRequest" - "ProxyResponse" - "FirewallRequest" - "FirewallResponse" # PITrail Event ([SMTP](#smtp-component) Component) This event traces the commands sent to the mail server, and the respective replies. ## Syntax *Go Syntax* ```text // SMTPPITrailEventArgs carries the SMTP PITrail event's parameters. type SMTPPITrailEventArgs struct {...} func (args *SMTPPITrailEventArgs) Direction() int32 func (args *SMTPPITrailEventArgs) Message() string // SMTPPITrailEvent defines the signature of the SMTP PITrail event's handler function. type SMTPPITrailEvent func(sender *SMTP, args *SMTPPITrailEventArgs) func (obj *SMTP) GetOnPITrailHandler() SMTPPITrailEvent func (obj *SMTP) SetOnPITrailHandler(handlerFunc SMTPPITrailEvent) ``` ## Remarks The PITrail event is useful for debugging purposes. It shows all of the interaction between the client and the server, line by line, except for message header and body transfers. The *Message* parameter contains the full text of the message. The *Direction* parameter shows the originator of the message: | | | | --- | --- | | 0 (Client) | The Message originates from the client. | | 1 (Server) | The Message originates from the server. | | 2 (Info) | The Message is an informative message originating from the client software (the struct code). | # SSLServerAuthentication Event ([SMTP](#smtp-component) Component) Fired after the server presents its certificate to the client. ## Syntax *Go Syntax* ```text // SMTPSSLServerAuthenticationEventArgs carries the SMTP SSLServerAuthentication event's parameters. type SMTPSSLServerAuthenticationEventArgs struct {...} func (args *SMTPSSLServerAuthenticationEventArgs) CertEncoded() []byte func (args *SMTPSSLServerAuthenticationEventArgs) CertSubject() string func (args *SMTPSSLServerAuthenticationEventArgs) CertIssuer() string func (args *SMTPSSLServerAuthenticationEventArgs) Status() string func (args *SMTPSSLServerAuthenticationEventArgs) Accept() bool func (args *SMTPSSLServerAuthenticationEventArgs) SetAccept(value bool) // SMTPSSLServerAuthenticationEvent defines the signature of the SMTP SSLServerAuthentication event's handler function. type SMTPSSLServerAuthenticationEvent func(sender *SMTP, args *SMTPSSLServerAuthenticationEventArgs) func (obj *SMTP) GetOnSSLServerAuthenticationHandler() SMTPSSLServerAuthenticationEvent func (obj *SMTP) SetOnSSLServerAuthenticationHandler(handlerFunc SMTPSSLServerAuthenticationEvent) ``` ## Remarks During this event, the client can decide whether or not to continue with the connection process. The *Accept* parameter is a recommendation on whether to continue or close the connection. This is just a suggestion: application software must use its own logic to determine whether or not to continue. When *Accept* is False, *Status* shows why the verification failed (otherwise, *Status* contains the string *OK*). If it is decided to continue, you can override and accept the certificate by setting the *Accept* parameter to True. # SSLStatus Event ([SMTP](#smtp-component) Component) Fired when secure connection progress messages are available. ## Syntax *Go Syntax* ```text // SMTPSSLStatusEventArgs carries the SMTP SSLStatus event's parameters. type SMTPSSLStatusEventArgs struct {...} func (args *SMTPSSLStatusEventArgs) Message() string // SMTPSSLStatusEvent defines the signature of the SMTP SSLStatus event's handler function. type SMTPSSLStatusEvent func(sender *SMTP, args *SMTPSSLStatusEventArgs) func (obj *SMTP) GetOnSSLStatusHandler() SMTPSSLStatusEvent func (obj *SMTP) SetOnSSLStatusHandler(handlerFunc SMTPSSLStatusEvent) ``` ## Remarks The event is fired for informational and logging purposes only. This event tracks the progress of the connection. # StartTransfer Event ([SMTP](#smtp-component) Component) This event is fired when the message text starts transferring. ## Syntax *Go Syntax* ```text // SMTPStartTransferEventArgs carries the SMTP StartTransfer event's parameters. type SMTPStartTransferEventArgs struct {...} func (args *SMTPStartTransferEventArgs) Direction() int32 // SMTPStartTransferEvent defines the signature of the SMTP StartTransfer event's handler function. type SMTPStartTransferEvent func(sender *SMTP, args *SMTPStartTransferEventArgs) func (obj *SMTP) GetOnStartTransferHandler() SMTPStartTransferEvent func (obj *SMTP) SetOnStartTransferHandler(handlerFunc SMTPStartTransferEvent) ``` ## Remarks If [MessageText](#messagetext-property-smtp-component) is not empty, the StartTransfer event is fired when the [MessageText](#messagetext-property-smtp-component) starts transferring from the local host to the [MailServer](#mailserver-property-smtp-component). If [MessageText](#messagetext-property-smtp-component) is empty, the event is not fired. If a file is attached to the [MessageText](#messagetext-property-smtp-component) via the AttachedFile property, then StartTransfer fires again when the file starts transferring. Please go to the description of the AttachedFile property for more information. The *Direction* parameter shows whether the client (0) or the server (1) is sending the data. # Transfer Event ([SMTP](#smtp-component) Component) This event is fired when the message text is transferred to MailServer . ## Syntax *Go Syntax* ```text // SMTPTransferEventArgs carries the SMTP Transfer event's parameters. type SMTPTransferEventArgs struct {...} func (args *SMTPTransferEventArgs) Direction() int32 func (args *SMTPTransferEventArgs) BytesTransferred() int64 func (args *SMTPTransferEventArgs) PercentDone() int32 func (args *SMTPTransferEventArgs) Text() []byte // SMTPTransferEvent defines the signature of the SMTP Transfer event's handler function. type SMTPTransferEvent func(sender *SMTP, args *SMTPTransferEventArgs) func (obj *SMTP) GetOnTransferHandler() SMTPTransferEvent func (obj *SMTP) SetOnTransferHandler(handlerFunc SMTPTransferEvent) ``` ## Remarks One or more Transfer events are fired during message delivery. Messages consist of [MessageText](#messagetext-property-smtp-component) and an optional AttachedFile. The *BytesTransferred* parameter shows the number of bytes sent starting from the beginning of [MessageText](#messagetext-property-smtp-component) or AttachedFile. *Text* contains the current portion of the message being sent. The *Direction* parameter shows whether the client (0) or the server (1) is sending the data. The *PercentDone* parameter shows the progress of the transfer in the corresponding direction. If *PercentDone* can not be calculated the value will be -1. NOTE: Events are not re-entrant. Performing time-consuming operations within this event will prevent it from firing again in a timely manner and may affect overall performance. # Config Settings ([SMTP](#smtp-component) Component) The struct accepts one or more of the following *configuration settings*. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the struct, access to these *internal properties* is provided through the [Config](#config-method-smtp-component) method. ### SMTP Config Settings **AllowEmptyTo**: If set to True, then the SendTo property is not required.Normally, the [SendTo](#sendto-property-smtp-component) property is required to send a message. If [AllowEmptyTo](#AllowEmptyTo) is True, then this is not the case, and messages can be sent with just one or both of [Cc](#cc-property-smtp-component) and [BCc](#bcc-property-smtp-component) set. **AuthorizationIdentity**: The value to use as the authorization identity when SASL authentication is used.When [AuthMechanism](#authmechanism-property-smtp-component) is set to amXOAUTH2, you may use this configuration setting to specify an authorization identity to be used when authenticating. In the case of amXOAUTH2, this should be your OAUTH authorization string. For instance: ```plaintext Bearer ya29.AHES6ZRmS-8xPbpGetC1VbABJIBRdKm-c4X7wMVGAbgxdGt5q8Ts3Q ``` NOTE: When using amXOAUTH2, [User](#user-property-smtp-component) must be specified, but [Password](#password-property-smtp-component) is not required. **Charset**: When set, the message headers will be encoded using the specified Charset.This configuration setting is used to specify the "charset" to be used to encode the message headers. For example, to use UTF-8 you can set this property to "UTF-8". The default value is "" (empty string) in which case the headers will not be encoded. **Hello**: The argument for HELO (herald) command to the server (defaults to local host name).The [Hello](#Hello) property specifies a string to send to the [MailServer](#mailserver-property-smtp-component) at connection time as an argument to the SMTP *HELO* command. This generally identifies the host sending mail, and that is why the [Hello](#Hello) property defaults to the name of the local host. The property is provided in case the struct does not accept the default value and a custom value (e.g., a fully qualified domain name) must be sent. If [AllowExtensions](#allowextensions-property-smtp-component) is True, the *EHLO* command will be sent instead of the *HELO* command. **KeepQueue**: If set to True, queued files are not deleted after a successful send.Normally, [ProcessQueue](#processqueue-method-smtp-component) deletes queued files after processing them. If [KeepQueue](#KeepQueue) is True, then the file extension is instead changed to ".sent" and the files are not deleted. **MaxHeaderLength**: Maximum length for headers to avoid line folding (default 80).The [MaxHeaderLength](#MaxHeaderLength) specifies the maximum line length supported by the mail delivery system. Any headers longer than [MaxHeaderLength](#MaxHeaderLength) are folded as specified in RFC 822. It is generally a good idea to use a [MaxHeaderLength](#MaxHeaderLength) of less than 100 bytes, although different mail relays and mail servers have different requirements for header lengths. **MessageHeadersString**: String representation of RFC822-encoded headers of the message.This setting holds the full headers of the message in RFC 822 format. Use this along with [TransferText](#TransferText) to store the entire message in RFC 822 format. **Example:** ```csharp smtp1.Send(); string rawMsg = smtp1.Config("MessageHeadersString") + smtp1.Config("TransferText"); ``` **MessageIdAlgorithm**: Determines the algorithm used to hash the random MessageId. The [MessageIdAlgorithm](#MessageIdAlgorithm) specifies which algorithm to use in the hash for the [MessageId](#messageid-property-smtp-component) when the property is set to "*". The default value is "SHA1". Possible values are as follows: - "MD5" - "SHA1" (default) - "SHA256" **OtherHeaders**: An RFC 822 compliant string consisting of extra headers.This is the same as the [OtherHeaders](#otherheaders-property-smtp-component) property. This configuration setting is exposed for use by structs that are inherited from SMTP. **ReturnPath**: Sets the Return-Path to be used for sending email.This is the same as the [ReturnPath](#returnpath-property-smtp-component) property. This configuration setting is exposed for use by structs that are inherited from SMTP. **SendRSET**: Whether to send RSET command.By default, the struct will periodically send the *RSET* command to the server. Changing this configuration setting to False will prevent the *RSET* command from being sent. This can be useful when interacting with some servers that do not respond properly to the *RSET* command. **StopOnBccErrors**: Instructs the struct to stop sending the message if the server does not acknowledge any of the BCCs.If this configuration setting is set to True, the struct will fail the moment the server does not acknowledge a Bcc address. If it is set to False, an error will be fired for every Bcc that is not recognized by the server, but the message will be sent to the rest of the recipients. The default value is False. **StopOnCcErrors**: Instructs the struct to stop sending the message if the server does not acknowledge any of the CCs.If this configuration setting is set to True, the struct will fail the moment the server does not acknowledge a Cc address. If it is set to False, an error will be fired for every Cc that is not recognized by the server, but the message will be sent to the rest of the recipients. The default value is True. **StopOnToErrors**: Instructs the struct to stop sending the message if the server does not acknowledge any of the TOs.If this configuration setting is set to True, the struct will fail the moment the server does not acknowledge a To address. If it is set to False, an error will be fired for every To that is not recognized by the server, but the message will be sent to the rest of the recipients. The default value is True. **TransferText**: String representation of RFC822-encoded body of the message.This configuration setting holds the full body of the message in RFC 822 format. Use this along with [MessageHeadersString](#MessageHeadersString) to store the entire message in RFC 822 format. **Example:** ```csharp smtp1.Send(); string rawMsg = smtp1.Config("MessageHeadersString") + smtp1.Config("TransferText"); ``` ### TCPClient Config Settings **ConnectionTimeout**: Sets a separate timeout value for establishing a connection.When set, this configuration setting allows you to specify a different timeout value for establishing a connection. Otherwise, the struct will use [Timeout](#timeout-property-smtp-component) for establishing a connection and transmitting/receiving data. **FirewallAutoDetect**: Tells the struct whether or not to automatically detect and use firewall system settings, if available.This configuration setting is provided for use by structs that do not directly expose Firewall properties. **FirewallHost**: Name or IP address of firewall (optional).If a [FirewallHost](#FirewallHost) is given, requested connections will be authenticated through the specified firewall when connecting. If the [FirewallHost](#FirewallHost) setting is set to a Domain Name, a DNS request is initiated. Upon successful termination of the request, the [FirewallHost](#FirewallHost) setting is set to the corresponding address. If the search is not successful, an error is returned. NOTE: This setting is provided for use by structs that do not directly expose Firewall properties. **FirewallHTTPVersion**: The HTTP version to be used when connecting through a tunneling proxy.When [FirewallType](#FirewallType) is set to a tunneling proxy, this setting dictates which HTTP version is used when connecting. **FirewallPassword**: Password to be used if authentication is to be used when connecting through the firewall.If [FirewallHost](#FirewallHost) is specified, the [FirewallUser](#FirewallUser) and [FirewallPassword](#FirewallPassword) settings are used to connect and authenticate to the given firewall. If the authentication fails, the struct fails with an error. NOTE: This setting is provided for use by structs that do not directly expose Firewall properties. **FirewallPort**: The TCP port for the FirewallHost;.The [FirewallPort](#FirewallPort) is set automatically when [FirewallType](#FirewallType) is set to a valid value. NOTE: This configuration setting is provided for use by structs that do not directly expose Firewall properties. **FirewallType**: Determines the type of firewall to connect through.Possible values are as follows: | | | | --- | --- | | 0 | No firewall (default setting). | | 1 | Connect through a tunneling proxy. [FirewallPort](#FirewallPort) is set to 80. | | 2 | Connect through a SOCKS4 Proxy. [FirewallPort](#FirewallPort) is set to 1080. | | 3 | Connect through a SOCKS5 Proxy. [FirewallPort](#FirewallPort) is set to 1080. | | 10 | Connect through a SOCKS4A Proxy. [FirewallPort](#FirewallPort) is set to 1080. | NOTE: This setting is provided for use by structs that do not directly expose Firewall properties. **FirewallUser**: A user name if authentication is to be used connecting through a firewall.If the [FirewallHost](#FirewallHost) is specified, the [FirewallUser](#FirewallUser) and [FirewallPassword](#FirewallPassword) settings are used to connect and authenticate to the Firewall. If the authentication fails, the struct fails with an error. NOTE: This setting is provided for use by structs that do not directly expose Firewall properties. **KeepAliveInterval**: The retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received.When set, [TCPKeepAlive](#TCPKeepAlive) will automatically be set to True. A TCP keep-alive packet will be sent after a period of inactivity as defined by [KeepAliveTime](#KeepAliveTime). If no acknowledgment is received from the remote host, the keep-alive packet will be sent again. This configuration setting specifies the interval at which the successive keep-alive packets are sent in milliseconds. This system default if this value is not specified here is 1 second. NOTE: This value is not applicable in macOS. **KeepAliveTime**: The inactivity time in milliseconds before a TCP keep-alive packet is sent.When set, [TCPKeepAlive](#TCPKeepAlive) will automatically be set to True. By default, the operating system will determine the time a connection is idle before a Transmission Control Protocol (TCP) keep-alive packet is sent. This system default if this value is not specified here is 2 hours. In many cases, a shorter interval is more useful. Set this value to the desired interval in milliseconds. **Linger**: When set to True, connections are terminated gracefully.This property controls how a connection is closed. The default is True. In the case that Linger is True (default), two scenarios determine how long the connection will linger. In the first, if [LingerTime](#LingerTime) is 0 (default), the system will attempt to send pending data for a connection until the default IP timeout expires. In the second scenario, if [LingerTime](#LingerTime) is a positive value, the system will attempt to send pending data until the specified [LingerTime](#LingerTime) is reached. If this attempt fails, then the system will reset the connection. The default behavior (which is also the default mode for stream sockets) might result in a long delay in closing the connection. Although the struct returns control immediately, the system could hold system resources until all pending data are sent (even after your application closes). Setting this property to False forces an immediate disconnection. If you know that the other side has received all the data you sent (e.g., by a client acknowledgment), setting this property to False might be the appropriate course of action. **LingerTime**: Time in seconds to have the connection linger. LingerTime is the time, in seconds, the socket connection will linger. This value is 0 by default, which means it will use the default IP timeout. **LocalHost**: The name of the local host through which connections are initiated or accepted. The [LocalHost](#localhost-property-smtp-component) setting contains the name of the local host as obtained by the *gethostname()* system call, or if the user has assigned an IP address, the value of that address. In multihomed hosts (machines with more than one IP interface), setting LocalHost to the value of an interface will make the struct initiate connections (or accept in the case of server structs) only through that interface. If the struct is connected, the [LocalHost](#localhost-property-smtp-component) setting shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multihomed hosts (machines with more than one IP interface). **LocalPort**: The port in the local host where the struct binds. This configuration setting must be set before a connection is attempted. It instructs the struct to bind to a specific port (or communication endpoint) in the local machine. Setting this to 0 (default) enables the system to choose a port at random. The chosen port will be shown by LocalPort after the connection is established. LocalPort cannot be changed once a connection is made. Any attempt to set this when a connection is active will generate an error. This configuration setting is useful when trying to connect to services that require a trusted port on the client side. An example is the remote shell (rsh) service in UNIX systems. **MaxLineLength**: The maximum amount of data to accumulate when no EOL is found.[MaxLineLength](#MaxLineLength) is the size of an internal buffer, which holds received data while waiting for an EOL string. If an EOL string is found in the input stream before [MaxLineLength](#MaxLineLength) bytes are received, the DataIn event is fired with the *EOL* parameter set to True, and the buffer is reset. If no EOL is found, and [MaxLineLength](#MaxLineLength) bytes are accumulated in the buffer, the DataIn event is fired with the *EOL* parameter set to False, and the buffer is reset. The minimum value for [MaxLineLength](#MaxLineLength) is 256 bytes. The default value is 2048 bytes. **MaxTransferRate**: The transfer rate limit in bytes per second.This configuration setting can be used to throttle outbound TCP traffic. Set this to the number of bytes to be sent per second. By default, this is not set and there is no limit. **ProxyExceptionsList**: A semicolon separated list of hosts and IPs to bypass when using a proxy.This configuration setting optionally specifies a semicolon-separated list of hostnames or IP addresses to bypass when a proxy is in use. When requests are made to hosts specified in this property, the proxy will not be used. For instance: *www.google.com;www.example.com* **TCPKeepAlive**: Determines whether or not the keep alive socket option is enabled.If set to True, the socket's keep-alive option is enabled and keep-alive packets will be sent periodically to maintain the connection. Set [KeepAliveTime](#KeepAliveTime) and [KeepAliveInterval](#KeepAliveInterval) to configure the timing of the keep-alive packets. NOTE: This value is not applicable in Java. **TcpNoDelay**: Whether or not to delay when sending packets. When set to True, the socket will send all data that are ready to send at once. When set to False, the socket will send smaller buffered packets of data at small intervals. This is known as the Nagle algorithm. By default, this configuration setting is set to False. **UseIPv6**: Whether to use IPv6.When set to *0* (default), the struct will use IPv4 exclusively. When set to *1*, the struct will use IPv6 exclusively. To instruct the struct to prefer IPv6 addresses, but use IPv4 if IPv6 is not supported on the system, this setting should be set to *2*. The default value is *0*. Possible values are as follows: | | | | --- | --- | | 0 | IPv4 only | | 1 | IPv6 only | | 2 | IPv6 with IPv4 fallback | **UseNTLMv2**: Whether to use NTLM V2.When authenticating with NTLM, this setting specifies whether NTLM V2 is used. By default this value is True and NTLM V2 will be used. Set this to False to use NTLM V1. ### SSL Config Settings **LogSSLPackets**: Controls whether SSL packets are logged when using the internal security API.When [SSLProvider](#sslprovider-property-smtp-component) is set to *Internal*, this configuration setting controls whether Secure Sockets Layer (SSL) packets should be logged. By default, this configuration setting is *False*, as it is useful only for debugging purposes. When enabled, SSL packet logs are output using the [SSLStatus](#sslstatus-event-smtp-component) event, which will fire each time an SSL packet is sent or received. Enabling this configuration setting has no effect if [SSLProvider](#sslprovider-property-smtp-component) is set to *Platform*. **OpenSSLCADir**: The path to a directory containing CA certificates.This functionality is available only when the provider is OpenSSL. The path set by this property should point to a directory containing CA certificates in PEM format. The files each contain one CA certificate. The files are looked up by the CA subject name hash value, which must hence be available. If more than one CA certificate with the same name hash value exist, the extension must be different (e.g., 9d66eef0.0, 9d66eef0.1). OpenSSL recommends the use of the c_rehash utility to create the necessary links. Please refer to the OpenSSL man page SSL_CTX_load_verify_locations(3) for details. **OpenSSLCAFile**: Name of the file containing the list of CA's trusted by your application.This functionality is available only when the provider is OpenSSL. The file set by this property should contain a list of CA certificates in PEM format. The file can contain several CA certificates identified by the following sequences: -----BEGIN CERTIFICATE----- ... (CA certificate in base64 encoding) ... -----END CERTIFICATE----- Before, between, and after the certificate text is allowed, which can be used, for example, for descriptions of the certificates. Refer to the OpenSSL man page SSL_CTX_load_verify_locations(3) for details. **OpenSSLCipherList**: A string that controls the ciphers to be used by SSL.This functionality is available only when the provider is OpenSSL. The format of this string is described in the OpenSSL man page ciphers(1) section "CIPHER LIST FORMAT". Please refer to it for details. The default string "DEFAULT" is determined at compile time and is normally equivalent to "ALL:!ADH:RC4+RSA:+SSLv2:@STRENGTH". **OpenSSLPrngSeedData**: The data to seed the pseudo random number generator (PRNG).This functionality is available only when the provider is OpenSSL. By default, OpenSSL uses the device file "/dev/urandom" to seed the PRNG, and setting OpenSSLPrngSeedData is not required. If set, the string specified is used to seed the PRNG. **ReuseSSLSession**: Determines if the SSL session is reused. If set to True, the struct will reuse the context if and only if the following criteria are met: - The target host name is the same. - The system cache entry has not expired (default timeout is 10 hours). - The application process that calls the function is the same. - The logon session is the same. - The instance of the struct is the same. **SSLCACerts**: A newline separated list of CA certificates to be included when performing an SSL handshake.When [SSLProvider](#sslprovider-property-smtp-component) is set to *Internal*, this configuration setting specifies one or more CA certificates to be included with the SSLCert property. Some servers or clients require the entire chain, including CA certificates, to be presented when performing SSL authentication. The value of this configuration setting is a newline-separated (CR/LF) list of certificates. For instance: ```text -----BEGIN CERTIFICATE----- MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw ... Intermediate Cert ... eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w F0I1XhM+pKj7FjDr+XNj -----END CERTIFICATE----- \r \n -----BEGIN CERTIFICATE----- MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp ... Root Cert ... d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA -----END CERTIFICATE----- ``` **SSLCheckCRL**: Whether to check the Certificate Revocation List for the server certificate.This configuration setting specifies whether the struct will check the Certificate Revocation List (CRL) specified by the server certificate. If set to 1 or 2, the struct will first obtain the list of CRL URLs from the server certificate's CRL distribution points extension. The struct will then make HTTP requests to each CRL endpoint to check the validity of the server's certificate. If the certificate has been revoked or any other issues are found during validation the struct fails with an error. When set to 0 (default), the CRL check will not be performed by the struct. When set to 1, it will attempt to perform the CRL check, but it will continue without an error if the server's certificate does not support CRL. When set to 2, it will perform the CRL check and will throw an error if CRL is not supported. This configuration setting is supported only in the Java, C#, and C++ editions. In the C++ edition, it is supported only on Windows operating systems. **SSLCheckOCSP**: Whether to use OCSP to check the status of the server certificate.This configuration setting specifies whether the struct will use OCSP to check the validity of the server certificate. If set to 1 or 2, the struct will first obtain the Online Certificate Status Protocol (OCSP) URL from the server certificate's OCSP extension. The struct will then locate the issuing certificate and make an HTTP request to the OCSP endpoint to check the validity of the server's certificate. If the certificate has been revoked or any other issues are found during validation, the struct fails with an error. When set to 0 (default), the struct will not perform an OCSP check. When set to 1, it will attempt to perform the OCSP check, but it will continue without an error if the server's certificate does not support OCSP. When set to 2, it will perform the OCSP check and will throw an error if OCSP is not supported. This configuration setting is supported only in the Java, C#, and C++ editions. In the C++ edition, it is supported only on Windows operating systems. **SSLCipherStrength**: The minimum cipher strength used for bulk encryption. This minimum cipher strength is largely dependent on the security modules installed on the system. If the cipher strength specified is not supported, an error will be returned when connections are initiated. NOTE: This configuration setting contains the minimum cipher strength requested from the security library. The actual cipher strength used for the connection is shown by the [SSLStatus](#sslstatus-event-smtp-component) event. Use this configuration setting with caution. Requesting a lower cipher strength than necessary could potentially cause serious security vulnerabilities in your application. When the provider is OpenSSL, [SSLCipherStrength](#SSLCipherStrength) is currently not supported. This functionality is instead made available through the [OpenSSLCipherList](#OpenSSLCipherList) configuration setting. **SSLClientCACerts**: A newline separated list of CA certificates to use during SSL client certificate validation.This configuration setting is only applicable to server components (e.g., TCPServer) see [SSLServerCACerts](#SSLServerCACerts) for client components (e.g., TCPClient). This setting can be used to optionally specify one or more CA certificates to be used when verifying the client certificate that is presented by the client during the SSL handshake when SSLAuthenticateClients is enabled. When verifying the client's certificate, the certificates trusted by the system will be used as part of the verification process. If the client's CA certificates are not installed to the trusted system store, they may be specified here so they are included when performing the verification process. This configuration setting should be set only if the client's CA certificates are not already trusted on the system and cannot be installed to the trusted system store. The value of this configuration setting is a newline-separated (CR/LF) list of certificates. For instance: ```text -----BEGIN CERTIFICATE----- MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw ... Intermediate Cert ... eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w F0I1XhM+pKj7FjDr+XNj -----END CERTIFICATE----- \r \n -----BEGIN CERTIFICATE----- MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp ... Root Cert ... d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA -----END CERTIFICATE----- ``` **SSLEnabledCipherSuites**: The cipher suite to be used in an SSL negotiation.This configuration setting enables the cipher suites to be used in SSL negotiation. By default, the enabled cipher suites will include all available ciphers ("*"). The special value "*" means that the struct will pick all of the supported cipher suites. If [SSLEnabledCipherSuites](#SSLEnabledCipherSuites) is set to any other value, only the specified cipher suites will be considered. Multiple cipher suites are separated by semicolons. Example values when [SSLProvider](#sslprovider-property-smtp-component) is set to *Platform* include the following: ```text obj.config("SSLEnabledCipherSuites=*"); obj.config("SSLEnabledCipherSuites=CALG_AES_256"); obj.config("SSLEnabledCipherSuites=CALG_AES_256;CALG_3DES"); ``` Possible values when [SSLProvider](#sslprovider-property-smtp-component) is set to *Platform* include the following: - CALG_3DES - CALG_3DES_112 - CALG_AES - CALG_AES_128 - CALG_AES_192 - CALG_AES_256 - CALG_AGREEDKEY_ANY - CALG_CYLINK_MEK - CALG_DES - CALG_DESX - CALG_DH_EPHEM - CALG_DH_SF - CALG_DSS_SIGN - CALG_ECDH - CALG_ECDH_EPHEM - CALG_ECDSA - CALG_ECMQV - CALG_HASH_REPLACE_OWF - CALG_HUGHES_MD5 - CALG_HMAC - CALG_KEA_KEYX - CALG_MAC - CALG_MD2 - CALG_MD4 - CALG_MD5 - CALG_NO_SIGN - CALG_OID_INFO_CNG_ONLY - CALG_OID_INFO_PARAMETERS - CALG_PCT1_MASTER - CALG_RC2 - CALG_RC4 - CALG_RC5 - CALG_RSA_KEYX - CALG_RSA_SIGN - CALG_SCHANNEL_ENC_KEY - CALG_SCHANNEL_MAC_KEY - CALG_SCHANNEL_MASTER_HASH - CALG_SEAL - CALG_SHA - CALG_SHA1 - CALG_SHA_256 - CALG_SHA_384 - CALG_SHA_512 - CALG_SKIPJACK - CALG_SSL2_MASTER - CALG_SSL3_MASTER - CALG_SSL3_SHAMD5 - CALG_TEK - CALG_TLS1_MASTER - CALG_TLS1PRF Example values when [SSLProvider](#sslprovider-property-smtp-component) is set to *Internal*include the following: ```text obj.config("SSLEnabledCipherSuites=*"); obj.config("SSLEnabledCipherSuites=TLS_DHE_DSS_WITH_AES_128_CBC_SHA"); obj.config("SSLEnabledCipherSuites=TLS_DHE_DSS_WITH_AES_128_CBC_SHA;TLS_ECDH_RSA_WITH_AES_128_CBC_SHA"); ``` Possible values when [SSLProvider](#sslprovider-property-smtp-component) is set to *Internal* include the following: - TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 - TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 - TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 - TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384 - TLS_RSA_WITH_AES_256_GCM_SHA384 - TLS_RSA_WITH_AES_128_GCM_SHA256 - TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256 - TLS_DHE_DSS_WITH_AES_256_GCM_SHA384 - TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 - TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384 - TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256 - TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 - TLS_DHE_DSS_WITH_AES_128_GCM_SHA256 - TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 - TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 - TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384 - TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 - TLS_RSA_WITH_AES_256_CBC_SHA256 - TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 - TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384 - TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 - TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 - TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 - TLS_RSA_WITH_AES_128_CBC_SHA256 - TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256 - TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256 - TLS_DHE_DSS_WITH_AES_128_CBC_SHA256 - TLS_RSA_WITH_AES_256_CBC_SHA - TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA - TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA - TLS_DHE_RSA_WITH_AES_256_CBC_SHA - TLS_ECDH_RSA_WITH_AES_256_CBC_SHA - TLS_DHE_DSS_WITH_AES_256_CBC_SHA - TLS_RSA_WITH_AES_128_CBC_SHA - TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA - TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA - TLS_ECDH_RSA_WITH_AES_128_CBC_SHA - TLS_DHE_RSA_WITH_AES_128_CBC_SHA - TLS_DHE_DSS_WITH_AES_128_CBC_SHA - TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA - TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA - TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA - TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA - TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA - TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA - TLS_RSA_WITH_3DES_EDE_CBC_SHA - TLS_RSA_WITH_DES_CBC_SHA - TLS_DHE_RSA_WITH_DES_CBC_SHA - TLS_DHE_DSS_WITH_DES_CBC_SHA - TLS_RSA_WITH_RC4_128_MD5 - TLS_RSA_WITH_RC4_128_SHA When TLS 1.3 is negotiated (see [SSLEnabledProtocols](#SSLEnabledProtocols)), only the following cipher suites are supported: - TLS_AES_256_GCM_SHA384 - TLS_CHACHA20_POLY1305_SHA256 - TLS_AES_128_GCM_SHA256 [SSLEnabledCipherSuites](#SSLEnabledCipherSuites) is used together with [SSLCipherStrength](#SSLCipherStrength). **SSLEnabledProtocols**: Used to enable/disable the supported security protocols.This configuration setting is used to enable or disable the supported security protocols. Not all supported protocols are enabled by default. The default value is *4032* for client components, and *3072* for server components. To specify a combination of enabled protocol versions set this config to the binary *OR* of one or more of the following values: | | | | --- | --- | | TLS1.3 | 12288 (Hex 3000) | | TLS1.2 | 3072 (Hex C00) (Default - Client and Server) | | TLS1.1 | 768 (Hex 300) (Default - Client) | | TLS1 | 192 (Hex C0) (Default - Client) | | SSL3 | 48 (Hex 30) | | SSL2 | 12 (Hex 0C) | Note that only TLS 1.2 is enabled for server components that accept incoming connections. This adheres to industry standards to ensure a secure connection. Client components enable TLS 1.0, TLS 1.1, and TLS 1.2 by default and will negotiate the highest mutually supported version when connecting to a server, which should be TLS 1.2 in most cases. **SSLEnabledProtocols: Transport Layer Security (TLS) 1.3 Notes:** By default when TLS 1.3 is enabled, the struct will first try to use the platform TLS 1.3 implementation when the [SSLProvider](#sslprovider-property-smtp-component) is set to Automatic for all editions. If the platform TLS 1.3 implementation is not available, the internal implementation will be used. In editions that are designed to run on Windows, [SSLProvider](#sslprovider-property-smtp-component) can be set to Platform to use the platform implementation instead of the internal implementation. When configured in this manner, please note that the platform provider is supported only on Windows 11/Windows Server 2022 and up. The default internal provider is available on all platforms and is not restricted to any specific OS version. If set to *1* (Platform provider), please be aware of the following notes: - The platform provider is available only on Windows 11/Windows Server 2022 and up. - [SSLEnabledCipherSuites](#SSLEnabledCipherSuites) and other similar SSL configuration settings are not supported. - If [SSLEnabledProtocols](#SSLEnabledProtocols) includes both TLS 1.3 and TLS 1.2, these restrictions are still applicable even if TLS 1.2 is negotiated. Enabling TLS 1.3 with the platform provider changes the implementation used for all TLS versions. **SSLEnabledProtocols: SSL2 and SSL3 Notes: ** SSL 2.0 and 3.0 are not supported by the struct when the [SSLProvider](#sslprovider-property-smtp-component) is set to internal. To use SSL 2.0 or SSL 3.0, the platform security API must have the protocols enabled and [SSLProvider](#sslprovider-property-smtp-component) needs to be set to platform. **SSLEnableRenegotiation**: Whether the renegotiation_info SSL extension is supported.This configuration setting specifies whether the renegotiation_info SSL extension will be used in the request when using the internal security API. This configuration setting is *false* by default, but it can be set to *true* to enable the extension. This configuration setting is applicable only when [SSLProvider](#sslprovider-property-smtp-component) is set to *Internal*. **SSLIncludeCertChain**: Whether the entire certificate chain is included in the SSLServerAuthentication event.This configuration setting specifies whether the Encoded parameter of the [SSLServerAuthentication](#sslserverauthentication-event-smtp-component) event contains the full certificate chain. By default this value is False and only the leaf certificate will be present in the Encoded parameter of the [SSLServerAuthentication](#sslserverauthentication-event-smtp-component) event. If set to True, all certificates returned by the server will be present in the Encoded parameter of the [SSLServerAuthentication](#sslserverauthentication-event-smtp-component) event. This includes the leaf certificate, any intermediate certificate, and the root certificate. **SSLKeyLogFile**: The location of a file where per-session secrets are written for debugging purposes.This configuration setting optionally specifies the full path to a file on disk where per-session secrets are stored for debugging purposes. When set, the struct will save the session secrets in the same format as the SSLKEYLOGFILE environment variable functionality used by most major browsers and tools, such as Chrome, Firefox, and cURL. This file can then be used in tools such as Wireshark to decrypt TLS traffic for debugging purposes. When writing to this file, the struct will only append, it will not overwrite previous values. NOTE: This configuration setting is applicable only when [SSLProvider](#sslprovider-property-smtp-component) is set to *Internal*. **SSLNegotiatedCipher**: Returns the negotiated cipher suite.This configuration setting returns the cipher suite negotiated during the SSL handshake. NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example: ```csharp server.Config("SSLNegotiatedCipher[connId]"); ``` **SSLNegotiatedCipherStrength**: Returns the negotiated cipher suite strength.This configuration setting returns the strength of the cipher suite negotiated during the SSL handshake. NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example: ```csharp server.Config("SSLNegotiatedCipherStrength[connId]"); ``` **SSLNegotiatedCipherSuite**: Returns the negotiated cipher suite.This configuration setting returns the cipher suite negotiated during the SSL handshake represented as a single string. NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example: ```csharp server.Config("SSLNegotiatedCipherSuite[connId]"); ``` **SSLNegotiatedKeyExchange**: Returns the negotiated key exchange algorithm.This configuration setting returns the key exchange algorithm negotiated during the SSL handshake. NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example: ```csharp server.Config("SSLNegotiatedKeyExchange[connId]"); ``` **SSLNegotiatedKeyExchangeStrength**: Returns the negotiated key exchange algorithm strength.This configuration setting returns the strength of the key exchange algorithm negotiated during the SSL handshake. NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example: ```csharp server.Config("SSLNegotiatedKeyExchangeStrength[connId]"); ``` **SSLNegotiatedVersion**: Returns the negotiated protocol version.This configuration setting returns the protocol version negotiated during the SSL handshake. NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example: ```csharp server.Config("SSLNegotiatedVersion[connId]"); ``` **SSLSecurityFlags**: Flags that control certificate verification.The following flags are defined (specified in hexadecimal notation). They can be ORed together to exclude multiple conditions: | | | | --- | --- | | 0x00000001 | Ignore time validity status of certificate. | | 0x00000002 | Ignore time validity status of CTL. | | 0x00000004 | Ignore non-nested certificate times. | | 0x00000010 | Allow unknown certificate authority. | | 0x00000020 | Ignore wrong certificate usage. | | 0x00000100 | Ignore unknown certificate revocation status. | | 0x00000200 | Ignore unknown CTL signer revocation status. | | 0x00000400 | Ignore unknown certificate authority revocation status. | | 0x00000800 | Ignore unknown root revocation status. | | 0x00008000 | Allow test root certificate. | | 0x00004000 | Trust test root certificate. | | 0x80000000 | Ignore non-matching CN (certificate CN non-matching server name). | This functionality is currently not available when the provider is OpenSSL. **SSLServerCACerts**: A newline separated list of CA certificates to use during SSL server certificate validation.This configuration setting is only used by client components (e.g., TCPClient) see [SSLClientCACerts](#SSLClientCACerts) for server components (e.g., TCPServer). This configuration setting can be used to optionally specify one or more CA certificates to be used when connecting to the server and verifying the server certificate. When verifying the server's certificate, the certificates trusted by the system will be used as part of the verification process. If the server's CA certificates are not installed to the trusted system store, they may be specified here so they are included when performing the verification process. This configuration setting should be set only if the server's CA certificates are not already trusted on the system and cannot be installed to the trusted system store. The value of this configuration setting is a newline-separated (CR/LF) list of certificates. For instance: ```text -----BEGIN CERTIFICATE----- MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw ... Intermediate Cert... eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w F0I1XhM+pKj7FjDr+XNj -----END CERTIFICATE----- \r \n -----BEGIN CERTIFICATE----- MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp ... Root Cert... d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA -----END CERTIFICATE----- ``` **TLS12SignatureAlgorithms**: Defines the allowed TLS 1.2 signature algorithms when SSLProvider is set to Internal.This configuration setting specifies the allowed server certificate signature algorithms when [SSLProvider](#sslprovider-property-smtp-component) is set to *Internal* and [SSLEnabledProtocols](#SSLEnabledProtocols) is set to allow TLS 1.2. When specified the struct will verify that the server certificate signature algorithm is among the values specified in this configuration setting. If the server certificate signature algorithm is unsupported, the struct fails with an error. The format of this value is a comma-separated list of hash-signature combinations. For instance: ```csharp component.SSLProvider = TCPClientSSLProviders.sslpInternal; component.Config("SSLEnabledProtocols=3072"); //TLS 1.2 component.Config("TLS12SignatureAlgorithms=sha256-rsa,sha256-dsa,sha1-rsa,sha1-dsa"); ``` The default value for this configuration setting is *sha512-ecdsa,sha512-rsa,sha512-dsa,sha384-ecdsa,sha384-rsa,sha384-dsa,sha256-ecdsa,sha256-rsa,sha256-dsa,sha224-ecdsa,sha224-rsa,sha224-dsa,sha1-ecdsa,sha1-rsa,sha1-dsa*. To not restrict the server's certificate signature algorithm, specify an empty string as the value for this configuration setting, which will cause the signature_algorithms TLS 1.2 extension to not be sent. **TLS12SupportedGroups**: The supported groups for ECC.This configuration setting specifies a comma-separated list of named groups used in TLS 1.2 for ECC. The default value is *ecdhe_secp256r1,ecdhe_secp384r1,ecdhe_secp521r1*. When using TLS 1.2 and [SSLProvider](#sslprovider-property-smtp-component) is set to *Internal*, the values refer to the supported groups for ECC. The following values are supported: - "ecdhe_secp256r1" (default) - "ecdhe_secp384r1" (default) - "ecdhe_secp521r1" (default) **TLS13KeyShareGroups**: The groups for which to pregenerate key shares.This configuration setting specifies a comma-separated list of named groups used in TLS 1.3 for key exchange. The groups specified here will have key share data pregenerated locally before establishing a connection. This can prevent an additional roundtrip during the handshake if the group is supported by the server. The default value is set to balance common supported groups and the computational resources required to generate key shares. As a result, only some groups are included by default in this configuration setting. NOTE: All supported groups can always be used during the handshake even if not listed here, but if a group is used that is not present in this list, it will incur an additional roundtrip and time to generate the key share for that group. In most cases, this configuration setting does not need to be modified. This should be modified only if there is a specific reason to do so. The default value is *ecdhe_x25519,ecdhe_secp256r1,ecdhe_secp384r1,ffdhe_2048,ffdhe_3072* The values are ordered from most preferred to least preferred. The following values are supported: - "ecdhe_x25519" (default) - "ecdhe_x448" - "ecdhe_secp256r1" (default) - "ecdhe_secp384r1" (default) - "ecdhe_secp521r1" - "ffdhe_2048" (default) - "ffdhe_3072" (default) - "ffdhe_4096" - "ffdhe_6144" - "ffdhe_8192" **TLS13SignatureAlgorithms**: The allowed certificate signature algorithms.This configuration setting holds a comma-separated list of allowed signature algorithms. Possible values include the following: - "ed25519" (default) - "ed448" (default) - "ecdsa_secp256r1_sha256" (default) - "ecdsa_secp384r1_sha384" (default) - "ecdsa_secp521r1_sha512" (default) - "rsa_pkcs1_sha256" (default) - "rsa_pkcs1_sha384" (default) - "rsa_pkcs1_sha512" (default) - "rsa_pss_sha256" (default) - "rsa_pss_sha384" (default) - "rsa_pss_sha512" (default) The default value is *rsa_pss_sha256,rsa_pss_sha384,rsa_pss_sha512,rsa_pkcs1_sha256,rsa_pkcs1_sha384,rsa_pkcs1_sha512,ecdsa_secp256r1_sha256,ecdsa_secp384r1_sha384,ecdsa_secp521r1_sha512,ed25519,ed448*. This configuration setting is applicable only when [SSLEnabledProtocols](#SSLEnabledProtocols) includes TLS 1.3. **TLS13SupportedGroups**: The supported groups for (EC)DHE key exchange.This configuration setting specifies a comma-separated list of named groups used in TLS 1.3 for key exchange. This configuration setting should be modified only if there is a specific reason to do so. The default value is *ecdhe_x25519,ecdhe_x448,ecdhe_secp256r1,ecdhe_secp384r1,ecdhe_secp521r1,ffdhe_2048,ffdhe_3072,ffdhe_4096,ffdhe_6144,ffdhe_8192,mlkem_512,mlkem_768,mlkem_1024,x25519_mlkem_768,secp256r1_mlkem_768* The values are ordered from most preferred to least preferred. The following values are supported: - "ecdhe_x25519" (default) - "ecdhe_x448" (default) - "ecdhe_secp256r1" (default) - "ecdhe_secp384r1" (default) - "ecdhe_secp521r1" (default) - "ffdhe_2048" (default) - "ffdhe_3072" (default) - "ffdhe_4096" (default) - "ffdhe_6144" (default) - "ffdhe_8192" (default) - "mlkem_512" (default) - "mlkem_768" (default) - "mlkem_1024" (default) - "x25519_mlkem_768" (default) - "secp256r1_mlkem_768" (default) Post-quantum algorithms (*mlkem_512,mlkem_768,mlkem_1024,x25519_mlkem_768,secp256r1_mlkem_768*) in our components rely on the operating system's underlying cryptographic primitives. The following platforms are currently supported: - Windows Server 2025 - Windows 11 24H2 - Windows 11 25H2 ### Socket Config Settings **AbsoluteTimeout**: Determines whether timeouts are inactivity timeouts or absolute timeouts.If [AbsoluteTimeout](#AbsoluteTimeout) is set to True, any method that does not complete within [Timeout](#timeout-property-smtp-component) seconds will be aborted. By default, *AbsoluteTimeout* is False, and the timeout is an inactivity timeout. NOTE: This option is not valid for User Datagram Protocol (UDP) ports. **FirewallData**: Used to send extra data to the firewall.When the firewall is a tunneling proxy, use this property to send custom (additional) headers to the firewall (e.g., headers for custom authentication schemes). **InBufferSize**: The size in bytes of the incoming queue of the socket.This is the size of an internal queue in the Transmission Control Protocol (TCP)/IP stack. You can increase or decrease its size depending on the amount of data that you will be receiving. In some cases, increasing the value of the *InBufferSize* setting can provide significant improvements in performance. Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the struct is activated the *InBufferSize* reverts to its defined size. The same happens if you attempt to make it too large or too small. **OutBufferSize**: The size in bytes of the outgoing queue of the socket.This is the size of an internal queue in the TCP/IP stack. You can increase or decrease its size depending on the amount of data that you will be sending. In some cases, increasing the value of the *OutBufferSize* setting can provide significant improvements in performance. Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the struct is activated the *OutBufferSize* reverts to its defined size. The same happens if you attempt to make it too large or too small. ### Base Config Settings **BuildInfo**: Information about the product's build.When queried, this setting will return a string containing information about the product's build. **CodePage**: The system code page used for Unicode to Multibyte translations.The default code page is Unicode UTF-8 (65001). The following is a list of valid code page identifiers: | | | | --- | --- | | Identifier | Name | | 037 | IBM EBCDIC - U.S./Canada | | 437 | OEM - United States | | 500 | IBM EBCDIC - International | | 708 | Arabic - ASMO 708 | | 709 | Arabic - ASMO 449+, BCON V4 | | 710 | Arabic - Transparent Arabic | | 720 | Arabic - Transparent ASMO | | 737 | OEM - Greek (formerly 437G) | | 775 | OEM - Baltic | | 850 | OEM - Multilingual Latin I | | 852 | OEM - Latin II | | 855 | OEM - Cyrillic (primarily Russian) | | 857 | OEM - Turkish | | 858 | OEM - Multilingual Latin I + Euro symbol | | 860 | OEM - Portuguese | | 861 | OEM - Icelandic | | 862 | OEM - Hebrew | | 863 | OEM - Canadian-French | | 864 | OEM - Arabic | | 865 | OEM - Nordic | | 866 | OEM - Russian | | 869 | OEM - Modern Greek | | 870 | IBM EBCDIC - Multilingual/ROECE (Latin-2) | | 874 | ANSI/OEM - Thai (same as 28605, ISO 8859-15) | | 875 | IBM EBCDIC - Modern Greek | | 932 | ANSI/OEM - Japanese, Shift-JIS | | 936 | ANSI/OEM - Simplified Chinese (PRC, Singapore) | | 949 | ANSI/OEM - Korean (Unified Hangul Code) | | 950 | ANSI/OEM - Traditional Chinese (Taiwan; Hong Kong SAR, PRC) | | 1026 | IBM EBCDIC - Turkish (Latin-5) | | 1047 | IBM EBCDIC - Latin 1/Open System | | 1140 | IBM EBCDIC - U.S./Canada (037 + Euro symbol) | | 1141 | IBM EBCDIC - Germany (20273 + Euro symbol) | | 1142 | IBM EBCDIC - Denmark/Norway (20277 + Euro symbol) | | 1143 | IBM EBCDIC - Finland/Sweden (20278 + Euro symbol) | | 1144 | IBM EBCDIC - Italy (20280 + Euro symbol) | | 1145 | IBM EBCDIC - Latin America/Spain (20284 + Euro symbol) | | 1146 | IBM EBCDIC - United Kingdom (20285 + Euro symbol) | | 1147 | IBM EBCDIC - France (20297 + Euro symbol) | | 1148 | IBM EBCDIC - International (500 + Euro symbol) | | 1149 | IBM EBCDIC - Icelandic (20871 + Euro symbol) | | 1200 | Unicode UCS-2 Little-Endian (BMP of ISO 10646) | | 1201 | Unicode UCS-2 Big-Endian | | 1250 | ANSI - Central European | | 1251 | ANSI - Cyrillic | | 1252 | ANSI - Latin I | | 1253 | ANSI - Greek | | 1254 | ANSI - Turkish | | 1255 | ANSI - Hebrew | | 1256 | ANSI - Arabic | | 1257 | ANSI - Baltic | | 1258 | ANSI/OEM - Vietnamese | | 1361 | Korean (Johab) | | 10000 | MAC - Roman | | 10001 | MAC - Japanese | | 10002 | MAC - Traditional Chinese (Big5) | | 10003 | MAC - Korean | | 10004 | MAC - Arabic | | 10005 | MAC - Hebrew | | 10006 | MAC - Greek I | | 10007 | MAC - Cyrillic | | 10008 | MAC - Simplified Chinese (GB 2312) | | 10010 | MAC - Romania | | 10017 | MAC - Ukraine | | 10021 | MAC - Thai | | 10029 | MAC - Latin II | | 10079 | MAC - Icelandic | | 10081 | MAC - Turkish | | 10082 | MAC - Croatia | | 12000 | Unicode UCS-4 Little-Endian | | 12001 | Unicode UCS-4 Big-Endian | | 20000 | CNS - Taiwan | | 20001 | TCA - Taiwan | | 20002 | Eten - Taiwan | | 20003 | IBM5550 - Taiwan | | 20004 | TeleText - Taiwan | | 20005 | Wang - Taiwan | | 20105 | IA5 IRV International Alphabet No. 5 (7-bit) | | 20106 | IA5 German (7-bit) | | 20107 | IA5 Swedish (7-bit) | | 20108 | IA5 Norwegian (7-bit) | | 20127 | US-ASCII (7-bit) | | 20261 | T.61 | | 20269 | ISO 6937 Non-Spacing Accent | | 20273 | IBM EBCDIC - Germany | | 20277 | IBM EBCDIC - Denmark/Norway | | 20278 | IBM EBCDIC - Finland/Sweden | | 20280 | IBM EBCDIC - Italy | | 20284 | IBM EBCDIC - Latin America/Spain | | 20285 | IBM EBCDIC - United Kingdom | | 20290 | IBM EBCDIC - Japanese Katakana Extended | | 20297 | IBM EBCDIC - France | | 20420 | IBM EBCDIC - Arabic | | 20423 | IBM EBCDIC - Greek | | 20424 | IBM EBCDIC - Hebrew | | 20833 | IBM EBCDIC - Korean Extended | | 20838 | IBM EBCDIC - Thai | | 20866 | Russian - KOI8-R | | 20871 | IBM EBCDIC - Icelandic | | 20880 | IBM EBCDIC - Cyrillic (Russian) | | 20905 | IBM EBCDIC - Turkish | | 20924 | IBM EBCDIC - Latin-1/Open System (1047 + Euro symbol) | | 20932 | JIS X 0208-1990 & 0121-1990 | | 20936 | Simplified Chinese (GB2312) | | 21025 | IBM EBCDIC - Cyrillic (Serbian, Bulgarian) | | 21027 | Extended Alpha Lowercase | | 21866 | Ukrainian (KOI8-U) | | 28591 | ISO 8859-1 Latin I | | 28592 | ISO 8859-2 Central Europe | | 28593 | ISO 8859-3 Latin 3 | | 28594 | ISO 8859-4 Baltic | | 28595 | ISO 8859-5 Cyrillic | | 28596 | ISO 8859-6 Arabic | | 28597 | ISO 8859-7 Greek | | 28598 | ISO 8859-8 Hebrew | | 28599 | ISO 8859-9 Latin 5 | | 28605 | ISO 8859-15 Latin 9 | | 29001 | Europa 3 | | 38598 | ISO 8859-8 Hebrew | | 50220 | ISO 2022 Japanese with no halfwidth Katakana | | 50221 | ISO 2022 Japanese with halfwidth Katakana | | 50222 | ISO 2022 Japanese JIS X 0201-1989 | | 50225 | ISO 2022 Korean | | 50227 | ISO 2022 Simplified Chinese | | 50229 | ISO 2022 Traditional Chinese | | 50930 | Japanese (Katakana) Extended | | 50931 | US/Canada and Japanese | | 50933 | Korean Extended and Korean | | 50935 | Simplified Chinese Extended and Simplified Chinese | | 50936 | Simplified Chinese | | 50937 | US/Canada and Traditional Chinese | | 50939 | Japanese (Latin) Extended and Japanese | | 51932 | EUC - Japanese | | 51936 | EUC - Simplified Chinese | | 51949 | EUC - Korean | | 51950 | EUC - Traditional Chinese | | 52936 | HZ-GB2312 Simplified Chinese | | 54936 | Windows XP: GB18030 Simplified Chinese (4 Byte) | | 57002 | ISCII Devanagari | | 57003 | ISCII Bengali | | 57004 | ISCII Tamil | | 57005 | ISCII Telugu | | 57006 | ISCII Assamese | | 57007 | ISCII Oriya | | 57008 | ISCII Kannada | | 57009 | ISCII Malayalam | | 57010 | ISCII Gujarati | | 57011 | ISCII Punjabi | | 65000 | Unicode UTF-7 | | 65001 | Unicode UTF-8 | The following is a list of valid code page identifiers for Mac OS only: | | | | --- | --- | | Identifier | Name | | 1 | ASCII | | 2 | NEXTSTEP | | 3 | JapaneseEUC | | 4 | UTF8 | | 5 | ISOLatin1 | | 6 | Symbol | | 7 | NonLossyASCII | | 8 | ShiftJIS | | 9 | ISOLatin2 | | 10 | Unicode | | 11 | WindowsCP1251 | | 12 | WindowsCP1252 | | 13 | WindowsCP1253 | | 14 | WindowsCP1254 | | 15 | WindowsCP1250 | | 21 | ISO2022JP | | 30 | MacOSRoman | | 10 | UTF16String | | 0x90000100 | UTF16BigEndian | | 0x94000100 | UTF16LittleEndian | | 0x8c000100 | UTF32String | | 0x98000100 | UTF32BigEndian | | 0x9c000100 | UTF32LittleEndian | | 65536 | Proprietary | **LicenseInfo**: Information about the current license.When queried, this setting will return a string containing information about the license this instance of a struct is using. It will return the following information: - Product: The product the license is for. - Product Key: The key the license was generated from. - License Source: Where the license was found (e.g., RuntimeLicense, License File). - License Type: The type of license installed (e.g., Royalty Free, Single Server). - Last Valid Build: The last valid build number for which the license will work. **MaskSensitiveData**: Whether sensitive data is masked in log messages.In certain circumstances it may be beneficial to mask sensitive data, like passwords, in log messages. Set this to *true* to mask sensitive data. The default is *true*. **UseInternalSecurityAPI**: Whether or not to use the system security libraries or an internal implementation. When set to *false*, the struct will use the system security libraries by default to perform cryptographic functions where applicable. Setting this configuration setting to *true* tells the struct to use the internal implementation instead of using the system security libraries. On Windows, this setting is set to *false* by default. On Linux/macOS, this setting is set to *true* by default. To use the system security libraries for Linux, OpenSSL support must be enabled. For more information on how to enable OpenSSL, please refer to the [OpenSSL Notes](platforms.md) section. # Trappable Errors ([SMTP](#smtp-component) Component) ### SMTP Errors | | | | --- | --- | | 118 | Firewall Error. Error message contains detailed description. | | 161 | SMTP protocol error. Description contains the server reply. | | 162 | Error communicating with server. Error text is attached. | | 163 | Please specify a [MailServer](#mailserver-property-smtp-component). | | 164 | Please specify a sender ([From](#from-property-smtp-component)). | | 165 | Please specify a recipient. | | 166 | Busy executing current method. | | 301 | Operation interrupted. | | 302 | Cannot open AttachedFile. | The class may also return one of the following error codes, which are inherited from other classes. ### TCPClient Errors | | | | --- | --- | | 100 | You cannot change the RemotePort at this time. A connection is in progress. | | 101 | You cannot change the RemoteHost (Server) at this time. A connection is in progress. | | 102 | The RemoteHost address is invalid (0.0.0.0). | | 104 | Already connected. If you want to reconnect, close the current connection first. | | 106 | You cannot change the LocalPort at this time. A connection is in progress. | | 107 | You cannot change the [LocalHost](#localhost-property-smtp-component) at this time. A connection is in progress. | | 112 | You cannot change [MaxLineLength](#MaxLineLength) at this time. A connection is in progress. | | 116 | RemotePort cannot be zero. Please specify a valid service port number. | | 117 | You cannot change the UseConnection option while the struct is active. | | 135 | Operation would block. | | 201 | Timeout. | | 211 | Action impossible in control's present state. | | 212 | Action impossible while not connected. | | 213 | Action impossible while listening. | | 301 | Timeout. | | 302 | Could not open file. | | 434 | Unable to convert string to selected CodePage. | | 1105 | Already connecting. If you want to reconnect, close the current connection first. | | 1117 | You need to connect first. | | 1119 | You cannot change the LocalHost at this time. A connection is in progress. | | 1120 | Connection dropped by remote host. | ### SSL Errors | | | | --- | --- | | 270 | Cannot load specified security library. | | 271 | Cannot open certificate store. | | 272 | Cannot find specified certificate. | | 273 | Cannot acquire security credentials. | | 274 | Cannot find certificate chain. | | 275 | Cannot verify certificate chain. | | 276 | Error during handshake. | | 280 | Error verifying certificate. | | 281 | Could not find client certificate. | | 282 | Could not find server certificate. | | 283 | Error encrypting data. | | 284 | Error decrypting data. | ### TCP/IP Errors | | | | --- | --- | | 10004 | [10004] Interrupted system call. | | 10009 | [10009] Bad file number. | | 10013 | [10013] Access denied. | | 10014 | [10014] Bad address. | | 10022 | [10022] Invalid argument. | | 10024 | [10024] Too many open files. | | 10035 | [10035] Operation would block. | | 10036 | [10036] Operation now in progress. | | 10037 | [10037] Operation already in progress. | | 10038 | [10038] Socket operation on nonsocket. | | 10039 | [10039] Destination address required. | | 10040 | [10040] Message is too long. | | 10041 | [10041] Protocol wrong type for socket. | | 10042 | [10042] Bad protocol option. | | 10043 | [10043] Protocol is not supported. | | 10044 | [10044] Socket type is not supported. | | 10045 | [10045] Operation is not supported on socket. | | 10046 | [10046] Protocol family is not supported. | | 10047 | [10047] Address family is not supported by protocol family. | | 10048 | [10048] Address already in use. | | 10049 | [10049] Cannot assign requested address. | | 10050 | [10050] Network is down. | | 10051 | [10051] Network is unreachable. | | 10052 | [10052] Net dropped connection or reset. | | 10053 | [10053] Software caused connection abort. | | 10054 | [10054] Connection reset by peer. | | 10055 | [10055] No buffer space available. | | 10056 | [10056] Socket is already connected. | | 10057 | [10057] Socket is not connected. | | 10058 | [10058] Cannot send after socket shutdown. | | 10059 | [10059] Too many references, cannot splice. | | 10060 | [10060] Connection timed out. | | 10061 | [10061] Connection refused. | | 10062 | [10062] Too many levels of symbolic links. | | 10063 | [10063] File name is too long. | | 10064 | [10064] Host is down. | | 10065 | [10065] No route to host. | | 10066 | [10066] Directory is not empty | | 10067 | [10067] Too many processes. | | 10068 | [10068] Too many users. | | 10069 | [10069] Disc Quota Exceeded. | | 10070 | [10070] Stale NFS file handle. | | 10071 | [10071] Too many levels of remote in path. | | 10091 | [10091] Network subsystem is unavailable. | | 10092 | [10092] WINSOCK DLL Version out of range. | | 10093 | [10093] Winsock is not loaded yet. | | 11001 | [11001] Host not found. | | 11002 | [11002] Nonauthoritative 'Host not found' (try again or check DNS setup). | | 11003 | [11003] Nonrecoverable errors: FORMERR, REFUSED, NOTIMP. | | 11004 | [11004] Valid name, no data record (check DNS setup). |