Mailu

A simple yet full-featured mail server delivered as a set of Docker images.

Mailu is a free, open-source mail server distributed as Docker images, designed to be set up and maintained without proprietary software or unrelated groupware features. It provides standard email protocols including IMAP, IMAP+, SMTP, and Submission with auto-configuration profiles for clients, alongside web access with multiple webmails and an administration interface.

Its feature set covers aliases, domain aliases, custom routing, full-text search of email attachments, auto-reply, auto-forward, fetched accounts, and managesieve for users. Admin capabilities include global admins, announcements, per-domain delegation, and quotas. Security features include enforced TLS, DANE, MTA-STS, Let's Encrypt, outgoing DKIM, an anti-virus scanner, Snuffleupagus, and blocking of malicious attachments. Antispam includes auto-learn, greylisting, DMARC and SPF, and anti-spoofing. It offers a web administration interface, a command line, and a RESTful API, and can be deployed via Docker Compose or Kubernetes with support for external MySQL/MariaDB or PostgreSQL database back-ends. Documentation is versioned to match the running release.

12 alternatives to Mailu

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Mailpile
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SquirrelMail
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MailEnable
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Key facts

Starts at: —
Free plan: No
Free trial: No
Open source: Yes

What it does

Imap and imap plus support
Smtp and submission with auto configuration profiles for clients
Aliases and domain aliases
Custom routing
Full text search of email attachments
Multiple webmails and administration interface
Auto reply and auto forward
Fetched accounts
Managesieve support
Global admins and announcements
Per domain delegation
Quotas
Enforced tls
Dane
Mta sts support with let s encrypt integration for certificates listed as letsencrypt and outgoing dkim signing anti virus scanner snuffleupagus and blocking of malicious attachments plus antispam features including auto learn greylisting dmarc and spf and anti spoofing all built on foss components with no trackers included the documentation is part of the repository and evolves alongside it so users should access the version matching their deployment release notes cover versions from freeposte io 1 1 2016 07 31 through mailu 2024 06 2024 06 with a demonstration server available for testing functionality and connecting to add domains setup involves preparing the environment choosing a mailu version and completing specific setup steps with docker compose requirements including hardware considerations and distribution selection before installing docker configuration files are created variables reviewed tls set up and mailu started with an alternative kubernetes setup and a configuration reference covering common mail web advanced antivirus infrastructure database and webmail settings plus header authentication via an external proxy dns setup covers the mail server hostname mx entries reverse dns entries and dkim spf dmarc entries while an external reverse proxy can be used with traefik on the same or a different host the database back end can be changed with migration to external mysql mariadb or postgresql supported and mailu postgresql available administration includes upgrading monitoring managing external let s encrypt certificates and migrating instances with a web administration interface for settings password updates auto reply fetched accounts authentication tokens announcements administrators relayed domains antispam mail domains webmail client setup website help and sign out spam filtering documentation explains how it works learning ham spam from existing mailboxes blocking emails from a domain changing authorized file attachment lists and fixing rejections of documents with macros a command line tool provides alias alias delete domain password user user import user delete config update config export and config import commands alongside a restful api with swagger json and built in swaggerui contributors follow a workflow covering forking vs committing commits branches pr workflow changelog and forked projects with project guidelines addressing general architecture configuration coding development environment git docker containers reviewing including reviewing by git web administration development documentation altering the database model code migration script local database upgrade feature fix commits pull requests translation updates information files i18n and l10n using poedit and firewalling network flows within mailu the site is built with sphinx using a read the docs theme with versions including v 2024 06 2024 06 2 0 and master

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