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grommunio vs Mailu: catalog facts
grommunio	Mailu
Freemium Open source, with paid plans listed on the pricing page.	Free Free and open source.
Linux, Web, Self-hosted	Linux, Self-hosted
Native MAPI, EWS and EAS support for Outlook and mobile clients Mail, calendars, chat, video and files on one platform	Webmail and admin interface included Per-domain delegation and quotas
Running a groupware server requires administration skills Some features may depend on paid plans	Requires Docker Releases are infrequent
Self-hosted, Hosted service	Self-hosted
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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