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b1gMailZimbra
Free

Free and open source under the GPL-2.0 licence.

 Paid

Sold in several editions under Zimbra's license terms; see the edition comparison.

Web, Self-hosted Web, Self-hosted
  • Runs on shared web hosting with PHP and MariaDB
  • Web admin panel for managing users and the service
  • Mail, calendar and contacts in one web client
  • Can be run on your own servers
  • Shared-hosting mode relies on POP3 catch-all mailboxes
  • Community site and documentation are partly in transition from the old website
  • Aimed at organisations rather than individuals
  • Running a mail server takes administration effort
Self-hosted Self-hosted, Hosted service
Open source Closed source
License: GPL-2.0 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 2, 2026

Checked October 1, 2026

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