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grommunioMDaemon Email Server
Freemium

Open source, with paid plans listed on the pricing page.

 Paid

Commercial licence with renewals; a free 30-day trial is available.

Linux, Web, Self-hosted Windows, Self-hosted
  • Native MAPI, EWS and EAS support for Outlook and mobile clients
  • Mail, calendars, chat, video and files on one platform
  • Self-hosted alternative to Exchange and Microsoft 365
  • Webmail, groupware and anti-spam in one package
  • Running a groupware server requires administration skills
  • Some features may depend on paid plans
  • Runs on Windows only
  • Paid licence with renewal fees
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

Checked October 1, 2026

Checked October 2, 2026

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