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lub 266ab665ee keep key during certificate renewal 3 months ago
.github Switched from "$(/usr/bin/git log -1 --format='%H')" to "$(/usr/bin/git rev-parse HEAD)" 7 months ago
core keep key during certificate renewal 3 months ago
design RFC: Mailu directory structure 3 years ago
docs Clarify that upgrades require a container restart 3 months ago
optional Add pytz module 4 months ago
setup Add data/fetchmail to mkdir command 4 months ago
tests doh 7 months ago
towncrier create PR2302 changelog 5 months ago
webmails Update application.ini 5 months ago
.gitignore use different alpine image for arm, add config for php images+arm 3 years ago
.mergify.yml Preparations for 1.9 release. 8 months ago Update 8 months ago Warn about rollbacks not working 3 months ago Add a code of conduct, fixes #319 5 years ago Update "the development guidelines" hyperlink 2 years ago Remove <> tags as they break markdown rendering 2 years ago Rename the freeposte/mailu directory and database 6 years ago fix spelling 11 months ago document 5 months ago changed semver example to 1.9.x 8 months ago
bors.toml Switch to github actions for CI/CD 1 year ago
pyproject.toml Fix the package setting 3 years ago


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.

Most of the documentation is available on our Website, you can also try our demo server before setting up your own, and come talk to us on Matrix.


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
  • Antispam, auto-learn, greylisting, DMARC and SPF
  • Freedom, all FOSS components, no tracker included



Mailu is free software, open to suggestions and contributions. All components are free software and compatible with the MIT license. All specific configuration files, Dockerfiles and code are placed under the MIT license.