This mail server software offers SMTP/POP3/IMAP and supports features such as AntiSpam, AntiVirus, content filter, aliases, routing, maillists, and mail robots. It also provides WebMail, statistics, and unlimited domains and users numbers. The authentication can be done through AD, ODBC, or txt. The AntiSpam feature uses Bayes learning through IMAP/HTTP, SPF, SenderID, RBL, and YDK.

The AntiVirus integration with 5 server antivirus APIs, including ClamAV, ensures complete protection from all kinds of malware. The software also has a content filter to block all kinds of sensitive content. Furthermore, it comes with aliases, routing, mail lists, mail robots, control web-interface, WebMail, and statistics features to help you manage your inbox effectively.
The Mail Server supports unlimited domains and users and allows for any methods of authorization, including ActiveDirectory, WinNT local, ODBC, and text lists. The software is also OpenSource, allowing you complete flexibility for customization, and has a plugins API and extensions such as PigMail, TrafC, Estat, and MContent to enable extended configurations, traffic shaping and quotas, extended statistics, and the handling of file attachments and MIME-parts.
Overall, if you're looking for a feature-rich, reliable, and secure mail server, then Mail Server is definitely worth considering.
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