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Name Description
Zimbra Collaboration Suite Innovative messagin and collaboration suite
Axigen Mail Server Mail server, offering (E)SMTP, POP3, IMAP4 and Webmail
IceWarp customizable and cost-effective alternative to Microsoft Exchange
Scalix Email and calendaring
PostPath Server enterprise-class email and collaboration server
Citadel open source groupware platform
Open-Xchange Server Messaging and collaboration server
Unison Server combines a telephone system, email and instant messaging in a single server
procmail Versatile e-mail processor
Kolab groupware server
qmail a secure, reliable, efficient, simple message transfer agent
Gordano Messaging Suite email, calendaring and collaboration messaging suite
Dovecot secure IMAP server that supports mbox, maildir, dbox and mdbox mailboxes