POP Component
Properties Methods Events Configuration Settings Errors
The POP Component is used to easily retrieve electronic mail from Internet Post Office servers (POP).
Syntax
nsoftware.IPWorksEDI.Pop
Remarks
The POP Component supports both plaintext and SSL/TLS connections (RFC 2595). When connecting over SSL/TLS the SSLServerAuthentication event allows you to check the server identity and other security attributes. The SSLStatus event provides information about the SSL handshake. Additional SSL related settings are also supported via the Config method.
The POP Component implements a standard internet post office (POP3) client as specified in RFC 1725.
To connect to a MailServer first set the appropriate User and Password and then connect by calling the Connect method. Upon successful connection to the MailServer, the number of waiting messages is shown by the MessageCount property. A message is selected by setting the MessageNumber property to a number between 1 and MessageCount (inclusive). Then, message text and/or headers are received by calling the Retrieve method.
The message text is received through the Transfer event, whereas the message headers are received through the Header event. Additionally, up to MaxLines from the message body are provided in the MessageText property. The body of the message is also saved in the file specified by the LocalFile property. StartTransfer and EndTransfer events are fired at the beginning and end of message transmission. The PITrail event provides a trace of the interaction between the client and server (excluding message transfers).
Property List
The following is the full list of the properties of the component with short descriptions. Click on the links for further details.
| AuthMechanism | The authentication mechanism to be used when connecting to the mail server. |
| Command | Used to send additional commands directly to the server. |
| Connected | Shows whether the component is connected. |
| Firewall | A set of properties related to firewall access. |
| Idle | The current status of the component. |
| IncludeHeaders | Instructs the component to include the headers in the MessageText and LocalFile. |
| LastReply | The last reply from the server. |
| LocalFile | The path to a local file for downloading the message body. If the file exists, it is overwritten (optional). |
| LocalHost | The name of the local host or user-assigned IP interface through which connections are initiated or accepted. |
| MailPort | The server port for POP (default 110). |
| MailServer | The name or address of a mail server (internet post office server). |
| MaxLines | The maximum number of message lines besides headers to retrieve. |
| Message | Provides the raw message content. |
| MessageCc | The value of the CC header of the last retrieved message. |
| MessageCount | The number of messages in the mailbox. |
| MessageDate | The value of the date header of the last retrieved message. |
| MessageFrom | The value of the from header of the last retrieved message. |
| MessageHeaders | Collection of the message headers as retrieved from the server. |
| MessageHeadersString | A string representation of the full headers of the message as retrieved from the server. |
| MessageNumber | Current (selected) message. |
| MessageRecipients | A collection of recipients for the current message. |
| MessageReplyTo | The value of the Reply-To header of the last retrieved message. |
| MessageSize | The size in bytes of the current message. |
| MessageSubject | The value of the Subject header of the last retrieved message. |
| MessageText | The full text of the message as retrieved from the server. |
| MessageTo | The value of the To header of the last retrieved message. |
| MessageUID | The unique identifier of the message as specified by the server. |
| Password | The password for the mailbox user. |
| SSLAcceptServerCert | Instructs the component to unconditionally accept the server certificate that matches the supplied certificate. |
| SSLCert | The certificate to be used during SSL negotiation. |
| SSLEnabled | Whether TLS/SSL is enabled. |
| SSLServerCert | The server certificate for the last established connection. |
| SSLStartMode | Determines how the component starts the SSL negotiation. |
| Timeout | A timeout for the component. |
| TotalSize | Cumulative size in bytes of messages in the mailbox (including headers). |
| User | The user identifier for the mailbox. |
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 server and attempts to login. |
| Delete | Deletes a message specified by MessageNumber on the server. |
| Disconnect | Disconnects from the mail server. |
| DoEvents | Processes events from the internal message queue. |
| Interrupt | Interrupt the current method. |
| ListMessageSizes | Retrieves a list of all message sizes from the server. |
| ListMessageUIDs | Retrieves a list of all message UIDs from the server. |
| LocalizeDate | Converts a valid RFC 822 message date to local date and time. |
| Reset | Resets all changes and revert back to the state when the user first connected. |
| Retrieve | Retrieves a message specified by MessageNumber from the server. |
| RetrieveHeaders | Retrieves headers for a message specified by MessageNumber . |
| SetMessageStream | Sets the stream to which the message downloaded from the server will be written. |
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 completes transferring. |
| Error | Information about errors during data delivery. |
| Header | Fired for every message header being retrieved. |
| MessageList | Fired for every message listed by ListMessageSizes and/or ListMessageUIDs . |
| PITrail | Traces the commands sent to the mail server, and the respective replies. |
| SSLServerAuthentication | Fired after the server presents its certificate to the client. |
| SSLStatus | Shows the progress of the secure connection. |
| StartTransfer | Fired when the message starts transferring. |
| Transfer | Fired while the message gets transferred from MailServer . |
Configuration Settings
The following is a list of configuration settings for the component with short descriptions. Click on the links for further details.
| AuthorizationIdentity | The value to use as the authorization identity when SASL authentication is used. |
| GetMessageSize | Whether to poll the server for the message size prior to retrieving it. |
| IncludeHeaders | Whether to include message headers in the LocalFile. |
| MaxHeaders | Instructs component to save the amount of headers specified that are returned by the server after a Header event has been fired. |
| MaxLineLength | The maximum expected length for message lines. |
| CloseStreamAfterTransfer | If true, the component will close the upload or download stream after the transfer. |
| 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). |
| FirewallListener | If true, the component binds to a SOCKS firewall as a server (IPPort only). |
| 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. |
| KeepAliveInterval | The retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received. |
| KeepAliveTime | The inactivity time in milliseconds before a TCP keep-alive packet is sent. |
| 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 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. |
| ProxyExceptionsList | A semicolon separated list of hosts and IPs to bypass when using a proxy. |
| TCPKeepAlive | Determines whether or not the keep alive socket option is enabled. |
| TcpNoDelay | Whether or not to delay when sending packets. |
| UseIPv6 | Whether to use IPv6. |
| UseNTLMv2 | Whether to use NTLM V2. |
| CACertFilePaths | The paths to CA certificate files when using Mono on Unix/Linux. |
| LogSSLPackets | Controls whether SSL packets are logged when using the internal security API. |
| ReuseSSLSession | Determines if the SSL session is reused. |
| SSLCACerts | A newline separated list of CA certificate to use during SSL client authentication. |
| SSLCheckCRL | Whether to check the Certificate Revocation List for the server certificate. |
| SSLCipherStrength | The minimum cipher strength used for bulk encryption. |
| SSLEnabledCipherSuites | The cipher suite to be used in an SSL negotiation. |
| SSLEnabledProtocols | Used to enable/disable the supported security protocols. |
| SSLEnableRenegotiation | Whether the renegotiation_info SSL extension is supported. |
| SSLIncludeCertChain | Whether the entire certificate chain is included in the SSLServerAuthentication event. |
| SSLNegotiatedCipher | Returns the negotiated ciphersuite. |
| SSLNegotiatedCipherStrength | Returns the negotiated ciphersuite strength. |
| SSLNegotiatedCipherSuite | Returns the negotiated ciphersuite. |
| SSLNegotiatedKeyExchange | Returns the negotiated key exchange algorithm. |
| SSLNegotiatedKeyExchangeStrength | Returns the negotiated key exchange algorithm strength. |
| SSLNegotiatedVersion | Returns the negotiated protocol version. |
| SSLProvider | The name of the security provider to use. |
| SSLSecurityFlags | Flags that control certificate verification. |
| SSLServerCACerts | A newline separated list of CA certificate to use during SSL server certificate validation. |
| TLS12SignatureAlgorithms | Defines the allowed TLS 1.2 signature algorithms when UseInternalSecurityAPI is True. |
| TLS12SupportedGroups | The supported groups for ECC. |
| TLS13KeyShareGroups | The groups for which to pregenerate key shares. |
| TLS13SignatureAlgorithms | The allowed certificate signature algorithms. |
| TLS13SupportedGroups | The supported groups for (EC)DHE key exchange. |
| 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. |
| BuildInfo | Information about the product's build. |
| GUIAvailable | Tells the component whether or not a message loop is available for processing events. |
| LicenseInfo | Information about the current license. |
| UseInternalSecurityAPI | Tells the component whether or not to use the system security libraries or an internal implementation. |