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grommunio vs SmarterMail: catalog facts
grommunio	SmarterMail
Freemium Open source, with paid plans listed on the pricing page.	Freemium Can be downloaded for free, with paid licences available to buy.
Linux, Web, Self-hosted	Windows, Linux, Web, Self-hosted
Native MAPI, EWS and EAS support for Outlook and mobile clients Mail, calendars, chat, video and files on one platform	Native MAPI support for Outlook without plug-ins Calendars, contacts, tasks, chat and meetings included
Running a groupware server requires administration skills Some features may depend on paid plans	Proprietary, closed-source software Running a mail server requires ongoing administration
Self-hosted, Hosted service	Downloadable app, Self-hosted
Open source	Closed source
License not stated	License not stated
Not stated if an account is 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 October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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