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FastMail - Email, calendars, and contacts to highest standards of security, privacy and reliability.
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.
Aliyun Mail - Aliyun is a provider of mobile operating systems and email services.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
mailcow - An open source mailserver suite.