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.

Features

Main features include:

• Standard email server, IMAP and IMAP+, SMTP and Submission with auto-configuration profiles for clients
• Advanced email features, aliases, domain aliases, custom routing, full-text search of email attachments, IMAP METADATA, and BURL-enabled submission for supporting mail clients
• Web access, multiple Webmails and administration interface
• User features, aliases, auto-reply, auto-forward, fetched accounts, managesieve, OpenPGP key publication through WKD, passkey sign-in to Webmail
• Admin features, global admins, announcements, per-domain delegation, quotas, passkey sign-in and user passkey management
• 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

Contributing

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.