PSMTP Component
Properties Methods Events Configuration Settings Errors
The PSMTP component is used to send encrypted and/or signed emails with or without attachments using OpenPGP.
Syntax
nsoftware.IPWorksOpenPGP.Psmtp
Remarks
You can send an OpenPGP signed and encrypted message using the PSMTP component by calling the Encrypt, Sign, and SignAndEncrypt methods. Additionally, it enables you to create messages bound for multiple recipients with different keys, simultaneously encrypt and compress with the most popular compression algorithms, and control other aspects such as the encrypting algorithm to use.
Construct the Message
To begin specify common email properties such as SendTo, Cc, BCc, Subject, and MessageText. Connection information is specified by setting MailServer, and MailPort.
Sign
To sign a message add the sender's private key to Keys. For instance:
psmtp.Keys.Add(new Key("c:\\my_keyring_dir", "sender@nsoftware.com"));
psmtp.Keys[0].Passphrase = "password";
The specified private key will be used to sign the message when Sign is called.
Encrypt
To both sign and encrypt a message call SignAndEncrypt.
To encrypt a message add the recipient's public key to RecipientKeys. For instance:
psmtp.RecipientKeys.Add(new Key("c:\\my_keyring_dir", "recipient@nsoftware.com"));
The specified public key will be used to encrypt the message when Encrypt is called.
Sign and Encrypt
You can call the SignAndEncrypt method to sign and encrypt messages in one step. Set the public key of the recipient to be used for encryption in the RecipientKeys property and the private key to be used to sign the message in .
Send
Once all the appropriate properties have been set, call the Send method and the message will be sent to its intended recipient(s).
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 | A switch allowing the component to use ESMTP features (SMTP extensions). |
| AuthMechanism | Used when connecting to the mail server. |
| BCc | A comma separated list of addresses for blind carbon copies (optional). |
| Cc | A comma separated list of addresses for carbon copies (optional). |
| Command | Used to send additional commands directly to the server. |
| CompressionMethod | The compression algorithm used. |
| Connected | Shows whether the component is connected. |
| DeliveryNotificationTo | Email address to send to which to send a delivery notification. |
| EncryptingAlgorithm | The encryption algorithm used when encrypting. |
| Firewall | A set of properties related to firewall access. |
| From | The email address of the sender (required). |
| Idle | The current status of the component. |
| Importance | Importance of the mail message (optional). |
| Keys | A collection of keys used for cryptographic operations. |
| LastReply | The last reply from the server. |
| LocalHost | The name of the local host or user-assigned IP interface through which connections are initiated or accepted. |
| MailPort | The server port for SMTP (default 25). |
| MailServer | The name or address of a mail server (mail relay). |
| Message | Provides a way to set the raw message content. |
| MessageDate | Date of the mail message (optional). |
| MessageHeaders | Collection of RFC822-encoded headers of the message. |
| MessageHeadersString | String representation of RFC822-encoded headers of the message. |
| MessageId | The Message Identifier for the message. |
| MessageRecipients | The collection of recipients of the message. |
| MessageText | The full text of the message to send (without headers). |
| OtherHeaders | An RFC 822 compliant string consisting of extra headers. |
| Password | A password for logon to the MailServer . |
| Priority | Priority of the mail message (optional). |
| ReadReceiptTo | Email address to send a read receipt to. |
| RecipientKeys | The collection of keys belonging to the recipient of the message. |
| ReplyTo | A mail address to which to reply (optional). |
| ReturnPath | Sets the Return-Path to be used for sending email. |
| SendTo | A comma separated list of addresses for destinations (required). |
| Sensitivity | Sensitivity of the mail message (optional). |
| SigningAlgorithm | The signature hash algorithm used when signing. |
| SSLAcceptServerCert | Instructs the component to unconditionally accept the server certificate that matches the supplied certificate. |
| SSLCert | The certificate to be used during SSL negotiation. |
| SSLServerCert | The server certificate for the last established connection. |
| SSLStartMode | Determines how the component starts the SSL negotiation. |
| Subject | The subject of the mail message (optional). |
| Timeout | A timeout for the component. |
| User | A user identifier to login 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 | Sets or retrieves a configuration setting . |
| Connect | Connects to the mail relay and sends the SMTP HELO command. |
| Disconnect | Disconnects from the SMTP server. |
| DoEvents | Processes events from the internal message queue. |
| Encrypt | Encrypts the message. |
| Expand | Asks the MailServer to expand a name or mailing list. |
| Interrupt | Interrupt the current method. |
| ProcessQueue | Sends the messages which have previously been queued into QueueDir . |
| Queue | Queues the message into QueueDir . |
| ResetHeaders | Resets all the message headers to empty. |
| Send | Sends the current message. |
| SendToTerminalAndEmail | Sends to terminal and email. |
| SendToTerminalOnly | Sends to terminal only. |
| SendToTerminalOrEmail | Sends to terminal or email. |
| SetMessageStream | Sets the stream to be uploaded to the server as part of the message. |
| Sign | Signs the message. |
| SignAndEncrypt | Signs and encrypts the current message. |
| Verify | 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 | Fired to indicate changes in connection state. |
| EndTransfer | Fired when the message text completes transferring. |
| Error | Information about errors during data delivery. |
| Expand | Fired for every email address returned by the server when the Expand method is called. |
| KeyPassphrase | Fired if the passphrase of current key is incorrect or empty. |
| PITrail | Traces the commands sent to the mail server, and the respective replies. |
| Progress | Fired as progress is made. |
| SSLServerAuthentication | Fired after the server presents its certificate to the client. |
| SSLStatus | Shows the progress of the secure connection. |
| StartTransfer | Fired when the message text starts transferring. |
| Status | Shows the progress of the operation. |
| Transfer | Fired while the message text gets transferred to MailServer . |
Configuration Settings
The following is a list of configuration settings for the component with short descriptions. Click on the links for further details.
| Comment | The OpenPGP message comment. |
| ClearSignature | Specifies whether or not to create a cleartext signature. |
| ProcessAttachments | Whether or not to process attachments. |
| LogLevel | Specifies the level of detail that is logged. |
| AutoSelectDSASignatureHashAlgorithm | Whether or not to select a suitable signature hash algorithm automatically. |
| CompressionLevel | The Zip or Zlib compression level. |
| SymmetricPassphrase | The password used for symmetric encryption or decryption. |
| VersionHeader | The Version header value in the ASCII armored OpenPGP message. |
| AllowEmptyTo | If set to True, then the SendTo property is not required. |
| AuthorizationIdentity | The value to use as the authorization identity when SASL authentication is used. |
| Charset | When set, the message headers will be encoded using the specified Charset. |
| Hello | The argument for HELO (herald) command to the server (defaults to local host name). |
| KeepQueue | If set to True, queued files are not deleted after a successful send. |
| MaxHeaderLength | Maximum length for headers to avoid line folding (default 80). |
| OtherHeaders | An RFC 822 compliant string consisting of extra headers. |
| ReturnPath | Sets the Return-Path to be used for sending email. |
| SendRSET | Whether to send RSET command. |
| StopOnToErrors | Instructs the component to stop sending the message if the server does not acknowledge any of the TOs. |
| StopOnCcErrors | Instructs the component to stop sending the message if the server does not acknowledge any of the CCs. |
| StopOnBccErrors | Instructs the component to stop sending the message if the server does not acknowledge any of the BCCs. |
| ConnectionTimeout | Sets a separate timeout value for establishing a connection. |
| FirewallAutoDetect | Tells the component whether or not to automatically detect and use firewall system settings, if available. |
| FirewallHost | Name or IP address of firewall (optional). |
| FirewallPassword | Password to be used if authentication is to be used when connecting through the firewall. |
| FirewallPort | The TCP port for the FirewallHost;. |
| FirewallType | Determines the type of firewall to connect through. |
| FirewallUser | A user name if authentication is to be used connecting through a firewall. |
| KeepAliveTime | The inactivity time in milliseconds before a TCP keep-alive packet is sent. |
| KeepAliveInterval | The retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received. |
| Linger | When set to True, connections are terminated gracefully. |
| LingerTime | Time in seconds to have the connection linger. |
| LocalHost | The name of the local host through which connections are initiated or accepted. |
| LocalPort | The TCP port in the local host where the component binds. |
| MaxLineLength | The maximum amount of data to accumulate when no EOL is found. |
| MaxTransferRate | The transfer rate limit in bytes per second. |
| RecordLength | The length of received data records. |
| TCPKeepAlive | Determines whether or not the keep alive socket option is enabled. |
| UseIPv6 | Whether to use IPv6. |
| TcpNoDelay | Whether or not to delay when sending packets. |
| ReuseSSLSession | Determines if the SSL session is reused. |
| SSLCipherStrength | The minimum cipher strength used for bulk encryption. |
| SSLEnabledProtocols | Used to enable/disable the supported security protocols. |
| SSLProvider | The name of the security provider to use. |
| SSLSecurityFlags | Flags that control certificate verification. |
| OpenSSLCADir | The path to a directory containing CA certificates. |
| OpenSSLCAFile | Name of the file containing the list of CA's trusted by your application. |
| OpenSSLCipherList | A string that controls the ciphers to be used by SSL. |
| OpenSSLPrngSeedData | The data to seed the pseudo random number generator (PRNG). |
| AbsoluteTimeout | Determines whether timeouts are inactivity timeouts or absolute timeouts. |
| FirewallData | Used to send extra data to the firewall. |
| InBufferSize | The size in bytes of the incoming queue of the socket. |
| OutBufferSize | The size in bytes of the outgoing queue of the socket. |
| CodePage | The system code page used for Unicode to Multibyte translations. |