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WildDuck vs SmarterMail: catalog facts
WildDuck	SmarterMail
Free Free open-source software that you host yourself.	Freemium Can be downloaded for free, with paid licences available to buy.
Linux, Self-hosted	Windows, Linux, Web, Self-hosted
Horizontal scaling with no single point of failure Full IMAP4rev1 support with many extensions	Native MAPI support for Outlook without plug-ins Calendars, contacts, tasks, chat and meetings included
Needs MongoDB, Redis and separate SMTP components Aimed at large deployments rather than small personal servers	Proprietary, closed-source software Running a mail server requires ongoing administration
Self-hosted	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.