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