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Citadel - Is a collaboration suite (messaging and groupware).
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.
MailEnable - MailEnable is a Windows based mail server and email server program that is packed with the state of the features and functions like antivirus and spam filtering system, webmail management system, cardDAV, CalDAV and much more.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Squirrelmail - SquirrelMail is a standards-based webmail package written in PHP.
mailcow - An open source mailserver suite.