Mail Server - SMTP/POP3/IMAP, AntiSpam (PopFile Bayes XMLRPC server, learning through IMAP/HTTP; SPF, SenderID, RBL, YahooDomainKeys), AntiVirus (integration with 5 server antivirus API, including ClamAV), content filter, aliases, routing, mail lists, mail robots, control web-interface, WebMail, statistics, unlimited domains and users number, any methods of authorization (ActiveDirectory, WinNT local, ODBC, text lists..). OpenSource, plugins API, extensions (PigMail - extended configuration, TrafC - traffic shaping and quotas, Estat - extended statistics, MContent - handle file attachments, MIME-parts.).