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Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
PowerMTA - PowerMTA is an industrial-strength software for high-volume email delivery.
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.
mailcow - An open source mailserver suite.
qmail - qmail is the name of an advanced level of mail transfer agent for the UNIX based operating systems.