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