MailMonitor 1.7.1.33 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The MailMonitor installer is commonly called MailMonitor.exe. We recommend checking the downloaded files with any free antivirus. The most popular versions among the software users are 1.7 and 1.6. This program is an intellectual property of DigiArch.org. The program belongs to Internet & Network Tools.
From the developer:
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 and received e-mails. It can store incoming and outgoing e-mail in a separate directory independent of mail clients. Finally, it keeps a trace of all e-mail related session traffic (at packet level).
You may want to check out more software, such as jetMailMonitor, which might be similar to MailMonitor.