Open source alternatives to Gmail

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mailcow-dockerized2026-11mailcow/mailcow-dockerized

mailcow: dockerized - 🐮 + 🐋 = 💕

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docker-mailserverv17.0.0docker-mailserver/docker-mailserver

Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.

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stalwartv1.1.0stalwartlabs/stalwart

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).