Outgoing messages in WinGate SMTP server are places into an SMTP Queue before they are sent to their destination. The SMTP queue API provides a set of functions for querying queued message data, monitoring SMTP queue events and deleting messages from the queue.

Monitoring Queue Messages

To monitor SMTP queue messages, register a SMTPQueueProcessorProviderInterface with a call to SMTPQueueRegisterProcessor. The SMTP framework will then call the functions of the SMTPQueueProcessorProviderInterface when there queue events occur.