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iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
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.
Roundcube - Web-based IMAP email client
Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
mailcow dockerized - An open source mailserver suite.
G Suite - Google's encompassing suite of cloud-based business apps.