Mailu is a simple yet full-featured mail server as a set of Docker images. It is free software (both as in free beer and as in free speech), open to suggestions and external contributions. The project aims at providing people with an easily setup, easily maintained and full-featured mail server while not shipping proprietary software nor unrelated features often found in popular groupware.

Main features include:

  • Standard email server, IMAP and IMAP+, SMTP and Submission with autoconfiguration profiles for clients

  • Advanced email features, aliases, domain aliases, custom routing

  • Web access, multiple Webmails and administration interface

  • User features, aliases, auto-reply, auto-forward, fetched accounts

  • Admin features, global admins, announcements, per-domain delegation, quotas

  • Security, enforced TLS, DANE, MTA-STS, Letsencrypt!, outgoing DKIM, anti-virus scanner, Snuffleupagus, block malicious attachments

  • Antispam, auto-learn, greylisting, DMARC and SPF, anti-spoofing

  • Freedom, all FOSS components, no tracker included


The documentation is written as part of the repository and evolves with it. Make sure that you access the proper version of the documentation, based on the version of Mailu that you are running.