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Open-source mail server software

10 mail server software whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.

  1. Dovecot Grade A

    IMAP and POP3 server for Linux and Unix that stores and serves mailboxes, with support for Sieve filtering through Pigeonhole. The Community Edition is open source.

    LGPL-2.1 and MIT. Source code

  2. Docker Mailserver Grade B

    Self-hosted mail server in a single Docker container, with SMTP, IMAP, POP3, spam and virus filtering, configured through files and environment variables.

    MIT. Source code

  3. iRedMail Grade B

    Installer script that sets up a complete mail server on Linux or BSD from open-source components such as Postfix, Dovecot, Roundcube and SpamAssassin.

    GPL-3.0. The paid iRedAdmin-Pro panel and Enterprise Edition are separate products. Source code

  4. Maddy Grade B

    All-in-one mail server written in Go that replaces Postfix, Dovecot and OpenDKIM with a single daemon, handling SMTP, IMAP, DKIM, SPF, DMARC, DANE and MTA-STS.

    GPL-3.0. Source code

  5. Mail-in-a-box Grade B

    Self-hosted mail server setup for a single Ubuntu machine, with SMTP, IMAP, webmail, contacts, calendar, spam filtering and backups preconfigured.

    CC0-1.0. Source code

  6. mailcow Grade B

    Self-hosted mail server suite based on Docker, with SMTP, IMAP, the SOGo webmail and groupware, spam filtering and a web admin interface.

    GPL-3.0. Source code

  7. Mailu Grade B

    Self-hosted mail server built from Docker containers, with SMTP, IMAP, webmail, spam and virus filtering and a web admin interface.

    MIT. Source code

  8. Mox Grade B

    Mail server written in Go for low-maintenance self-hosting, combining SMTP, IMAP, webmail, SPF, DKIM, DMARC, MTA-STS, automatic TLS and spam filtering in one program.

    MIT. Source code

  9. Postfix Grade B

    Mail transfer agent that routes and delivers email over SMTP, used on many Linux and Unix servers as the default mail server.

    Dual-licensed under EPL-2.0 and IPL-1.0. Source code

  10. Modoboa Grade C

    Self-hosted mail hosting and management platform built on Postfix and Dovecot, with a web admin interface, webmail, calendars, contacts and spam filtering.

    ISC. Source code

Compare all 13 mail server software, open source or not.