You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Go to file
lub 5b9c2e5336 keep key during certificate renewal 6 months ago
.github runner.temp is what should be used 7 months ago
core keep key during certificate renewal 6 months ago
design Switch from RainLoop to SnappyMail 1 year ago
docs Merge #2448 6 months ago
optional Merge branch 'master' of into feature-switch-snappymail 9 months ago
setup Remove the misleading text in mailu.env that zstd and lz4 are supported for dovecot mail compression. 8 months ago
tests Doh! 7 months ago
towncrier Merge #2468 6 months ago
webmails Merge #2423 7 months ago
.gitignore use different alpine image for arm, add config for php images+arm 4 years ago
.mergify.yml Preparations for 1.9 release. 1 year ago Update 1 year ago Warn about rollbacks not working 11 months ago Add a code of conduct, fixes #319 5 years ago Update "the development guidelines" hyperlink 3 years ago Remove <> tags as they break markdown rendering 3 years ago Rename the freeposte/mailu directory and database 7 years ago fix spelling 2 years ago document 1 year ago changed semver example to 1.9.x 1 year ago Create 7 months ago
bors.toml Switch to github actions for CI/CD 2 years ago
pyproject.toml Fix the package setting 4 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.