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Mailu vs b1gMail: catalog facts
Mailu	b1gMail
Free Free and open source.	Free Free and open source under the GPL-2.0 licence.
Linux, Self-hosted	Web, Self-hosted
Webmail and admin interface included Per-domain delegation and quotas	Runs on shared web hosting with PHP and MariaDB Web admin panel for managing users and the service
Requires Docker Releases are infrequent	Shared-hosting mode relies on POP3 catch-all mailboxes Community site and documentation are partly in transition from the old website
Self-hosted	Self-hosted
Open source	Open source
License not stated	License: GPL-2.0
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.