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Mailu vs MDaemon Email Server: catalog facts
Mailu	MDaemon Email Server
Free Free and open source.	Paid Commercial licence with renewals; a free 30-day trial is available.
Linux, Self-hosted	Windows, Self-hosted
Webmail and admin interface included Per-domain delegation and quotas	Self-hosted alternative to Exchange and Microsoft 365 Webmail, groupware and anti-spam in one package
Requires Docker Releases are infrequent	Runs on Windows only Paid licence with renewal fees
Self-hosted	Downloadable app, Self-hosted
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.