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Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
Cyrus IMAP - The Cyrus IMAP server differs from other IMAP server implementations in that it is generally...
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
DBMail - DBMail is a fast, scalable IMAP4 and POP3 server that stores all email and users in a Postgresql...
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
Courier IMAP - The Courier IMAP server is a fast, scalable, enterprise IMAP server that uses Maildirs.