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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.
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
mailcow - An open source mailserver suite.
YouTeam - YouTeam is a new, smarter way to outsource.
Microsoft Exchange Server - Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.