Discover / Marketing

Mailu

Name: Mailu
Author: Mailu

by MailuPython

Self-hosted mail server for email marketing and transactional sending.

Toolstable

Maturity: stable because 11y old, 2024.06.57 released 8d ago. Derived from release and commit history, not a rating.

Stars: 7.4k
Forks: 991
Downloads / mo: —
Last commit: 2026-07-27
License: NOASSERTION
Open issues: 125

Market and trust evidence

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In practice

Written by AI from this repository’s README · medium confidence

Running your own mail requires assembling SMTP, IMAP, antispam, DKIM and webmail components by hand.

Use it when

Use it when you want to self host email with TLS, antispam and admin tooling already wired together.

Not the right pick when

It deliberately excludes groupware and other unrelated features, so it is not a full collaboration suite.

Capabilities

IMAP, IMAP+, SMTP and Submission with client auto-configuration
aliases, domain aliases, custom routing and full-text attachment search
multiple webmails plus an administration interface
enforced TLS, DANE, MTA-STS, Letsencrypt and outgoing DKIM
antispam with auto-learn, greylisting, DMARC and SPF
anti-virus scanner and malicious attachment blocking

Requirements

Docker, since Mailu ships as a set of Docker images

Cost: Free and open source

Compare Repository ↗Homepage ↗

Video walkthroughs

Setting Up Mailu: Build Your Own Docker-Based SMTP Mail Server on Ubuntu

VktTech · 1K views · ≈Aug 2025

Mailu Mail Server Setup (Docker) – Mailcow vs Mailu Showdown!

The SysAdmin Hub · 10K views · ≈Feb 2026

Make a Debian Email Server Using Mailu, RackNerd and Cloudflare

Web Shanks · 5K views · ≈Aug 2024

Third-party YouTube uploads matched to this tool by title, channel and repository name on 2026-08-03. Not made, reviewed or endorsed by SkillPilot. View counts and publish months are as of the match date and the month is approximate. Nothing loads from YouTube until you press play.

What the repository ships

Has testsHas docsSecurity policyCI configured

Detected from the actual files in the repository root.

Latest release 2024.06.57

Published 2026-07-26

Changelog :mailbox:

Fix autoconfig on modern k9-mail

This release was triggered by PR/Issue 4075.

The release notes of the original main release can be accessed via menu item 'Release notes' on mailu.io.

Update

The main version X.Y (e.g. 1.9) will always reflect the latest version of the branch. To update your Mailu installation simply pull the latest images \docker compose pull && docker compose up -d\.

The pinned version X.Y.Z (e.g. 1.9.1) is not updated. It is pinned to the commit that was used for creating this release. You can use a pinned version to make sure your Mailu installation is not suddenly updated when recreating containers. The pinned version allows the user to manually update. It also allows to go back to a previous pinned version.

README

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
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

Domains

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.