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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
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Kopano - Sharing & communication software for business
mailcow - An open source mailserver suite.
Google Workspace - Google's encompassing suite of cloud-based business apps.