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iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Emails - Simple, easy and secure mail server with a convenient and simple interface.
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.
Citadel - Is a collaboration suite (messaging and groupware).
Microsoft Exchange Server - Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.