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Vote for FTGate
FTGate4 is a Windows mail server that combines mail handling facilities with Groupware functionality. FTGate4 can also be used to connect any mail server to the Internet and provides content filtering, POP3 mail retrieval, security features and anti-virus integration to be included without having to replace your primary mail server. Users of systems such as Microsoft Exchange, Lotus Domino and others can now add features such as Key word and Key Phrase filtering, Attachment Filtering, Anti-Virus support, Comprehensive routing and more
FTGate4 features include calendaring, contacts, IMAP, security, anti-spam facilities, anti-virus support, multiple domains, Web Administration, WebMail, instant messaging, SSL and more.