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Mailu vs Mailcow: catalog facts
Mailu	Mailcow
Free Free and open source.	Free Free and open source, self-hosted.
Linux, Self-hosted	Linux, Self-hosted
Webmail and admin interface included Per-domain delegation and quotas	Docker packaging makes deployment and updates more manageable Includes a full web admin panel and SOGo webmail out of the box
Requires Docker Releases are infrequent	Requires Docker and server administration knowledge to run Resource requirements are higher than a single lightweight mail daemon
Self-hosted	Self-hosted
Open source	Open 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 September 22, 2026

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