Mailu

mailu.io · checked 3 Oct 2026

#7 · Email Server Software #10 · Mail Server Software

Visit mailu.io ↗ Alternatives Mailu vs iRedMail

How it plugs in

—Public API

NoOpen source

YesFree tier

Signal on Email Server Software6.2#7 of 33

The project aims to provide an easily set up and maintained full-featured mail server without proprietary software or unrelated groupware features.

Pricing

MailuFree software; self-hosted mail server; no hosted plan or price statedFree

As mailu.io lists them, checked 3 Oct 2026.

Near it

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: mailu.io
Price: Free tier
Free trial: Not stated
Administration: Admin features include global administrators, announcements, per-domain delegation, and quotas.
Deployment: Mailu runs as Docker containers and documents Docker Compose and Kubernetes deployment options.
Founded: 2014
Hardware: The setup guide says Mailu ships multi-architecture images for linux/amd64, linux/arm64v8, and linux/armv7 hardware.
Integrations: The documentation describes Nextcloud authentication through IMAP and calendar and address-book access through Radicale using WebDAV/CardDAV/CalDAV clients.
Mail management: Features include aliases, domain aliases, custom routing, and full-text search of email attachments.
Mail protocols: It supports IMAP, IMAP+, SMTP, and Submission, with client auto-configuration profiles.
Privacy: The project states that it uses all free and open-source software components and includes no tracker.
Requirements: The documentation lists minimum memory and swap of 1 GB each without ClamAV, or 3 GB memory and 1 GB swap with ClamAV.
Security: Listed security features include enforced TLS, DANE, MTA-STS, Let's Encrypt, outgoing DKIM, antivirus scanning, and blocking malicious attachments.
Spam controls: Listed antispam features include auto-learning, greylisting, DMARC, SPF, and anti-spoofing.
Support: The project directs simple questions to its Matrix room, complex questions to GitHub discussions, and bug reports to GitHub issues; it describes itself as mostly developed in contributors' free time.

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