MailMonitor is a program enabling you to monitor incoming and outgoing mail traffic to and from you mail server and clients. It tracks, displays and logs incoming and outgoing SMTP sessions, POP sessions and sent/received e-mails.
MailMonitor can store incoming and outgoing e-mail in a separate directory independent of mail clients. Finally, MailMonitor keeps a trace of all e-mail related session traffic (at packet level) enabling you to explore in depth what is going on in your e-mail environment.
These features make MailMonitor a valuable tool for tracking your e-mail flow within your e-mail environment helping solve various problems including sending or receiving off e-mail, SMTP hacking and a host of other e-mail server related problems.
The bottom line is if you have mail server problems, MailMonitor shows you what's going on at port and packet level to help solve mail server problems.