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Mailu vs grommunio: catalog facts
Mailu	grommunio
Free Free and open source.	Freemium Open source, with paid plans listed on the pricing page.
Linux, Self-hosted	Linux, Web, Self-hosted
Webmail and admin interface included Per-domain delegation and quotas	Native MAPI, EWS and EAS support for Outlook and mobile clients Mail, calendars, chat, video and files on one platform
Requires Docker Releases are infrequent	Running a groupware server requires administration skills Some features may depend on paid plans
Self-hosted	Self-hosted, Hosted service
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 October 1, 2026

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