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, managesieve

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

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.