*Feature Request* Mail Flow Monitor

It would be extremely beneficial to have the ability to test actual mail flow. Something that could send email to a specific box and then perhaps check that box with IMAP or POP3.

In some cases you may have all services running and operational but for some reason, mail flow may be stopped or even delayed. This feature would be an invaluable asset.

The ability to monitor mail flow along with the ability to set thresholds for sending and receiving times. That way if your mail is flowing but very slowly, you can be alerted to a possible upcoming issue.