Compare software

SmarterMail vs Mailu: catalog facts
SmarterMail	Mailu
Freemium Can be downloaded for free, with paid licences available to buy.	Free Free and open source.
Windows, Linux, Web, Self-hosted	Linux, Self-hosted
Native MAPI support for Outlook without plug-ins Calendars, contacts, tasks, chat and meetings included	Webmail and admin interface included Per-domain delegation and quotas
Proprietary, closed-source software Running a mail server requires ongoing administration	Requires Docker Releases are infrequent
Downloadable app, Self-hosted	Self-hosted
Closed 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.