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Mailu vs Maddy: catalog facts
Mailu	Maddy
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	Single-binary deployment simplifies installation compared to multi-package mail stacks Written in Go with a composable configuration model
Requires Docker Releases are infrequent	Smaller community and fewer guides than more established mail servers Still requires Linux server administration to run
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.