Open-Source Self-Hosted Secure Email Gateway. Self-hosted email security, mail server, calendar, contacts, files, groupware — one stack.

Hermes Secure Email Gateway is an open-source Docker Compose stack that combines a hardened anti-spam and anti-malware gateway, a full Dovecot 2.4 mail server, end-to-end encryption, and Nextcloud for files, calendars, and contacts. Deploy it as a gateway in front of Microsoft 365, as a complete mail server, or in hybrid mode.

• Hermes Secure Email Gateway and Email Server @ GitHub.

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

docker-mailserver, or DMS for short, is a production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Anti-spam, Anti-virus, etc.). It employs only configuration files, no SQL database. The image is focused around the slogan "Keep it simple and versioned".

• Docker Mailserver @ GitHub.

mailcow: dockerized is an open source groupware/email suite based on docker.

mailcow relies on many well known and long used components, which in combination result in an all around carefree email server.

• mailcow: dockerized @ GitHub

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• Héberger ses emails chez soi, en 2026 : une très mauvaise idée… que j'ai quand même voulu essayer @ Cyril Beaufrere's LinkedIn :fr:.

Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container. Only configuration files, no SQL database. Keep it simple and versioned. Easy to deploy and upgrade. Documentation via MkDocs.