Mailu

Spec sheet

Purpose

The project aims to provide an easily set up and maintained full-featured mail server without proprietary software or unrelated groupware features.Read 3 Oct 2026 · mailu.io

Product

Mailu is a free software mail server distributed as a set of Docker images.Read 3 Oct 2026 · mailu.io

Deployment

Mailu runs as Docker containers and documents Docker Compose and Kubernetes deployment options.Read 3 Oct 2026 · mailu.io

Integrations

The documentation describes Nextcloud authentication through IMAP and calendar and address-book access through Radicale using WebDAV/CardDAV/CalDAV clients.Read 3 Oct 2026 · mailu.io

Security

Listed security features include enforced TLS, DANE, MTA-STS, Let's Encrypt, outgoing DKIM, antivirus scanning, and blocking malicious attachments.Read 3 Oct 2026 · mailu.io

Privacy

The project states that it uses all free and open-source software components and includes no tracker.Read 3 Oct 2026 · mailu.io

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.Read 3 Oct 2026 · mailu.io

Founded

2014Read 28 Sep 2026 · mailu.io

Administration

Admin features include global administrators, announcements, per-domain delegation, and quotas.Read 3 Oct 2026 · mailu.io

Hardware

The setup guide says Mailu ships multi-architecture images for linux/amd64, linux/arm64v8, and linux/armv7 hardware.Read 3 Oct 2026 · mailu.io

Limitations

The setup guide cautions that Mailu is not massively tested and recommends testing every feature before using it for a critical mail server; it also says long-term professional support seekers should consider Poste.io.Read 3 Oct 2026 · mailu.io

Mail management

Features include aliases, domain aliases, custom routing, and full-text search of email attachments.Read 3 Oct 2026 · mailu.io

Mail protocols

It supports IMAP, IMAP+, SMTP, and Submission, with client auto-configuration profiles.Read 3 Oct 2026 · mailu.io

Requirements

The documentation lists minimum memory and swap of 1 GB each without ClamAV, or 3 GB memory and 1 GB swap with ClamAV.Read 3 Oct 2026 · mailu.io

Spam controls

Listed antispam features include auto-learning, greylisting, DMARC, SPF, and anti-spoofing.Read 3 Oct 2026 · mailu.io

Web and user features

It provides webmail and administration interfaces, plus user features such as auto-reply, auto-forward, fetched accounts, and managesieve.Read 3 Oct 2026 · mailu.io

Plans and prices

Every Mailu plan and price →

Where Specifiction places it

• Mail Server Software#18 of 347.9