hMailServer 6.3.8 is the current release, signed 2 November 2026. Windows and Linux, and an in-place upgrade from 5.3 or later, but for the original hMailServer's 5.7.Download 6.3.8 Documentation FAQ

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Managed hMailServer

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Paid deployment, migration, hardening, monitoring and backups from Progressive Robot Ltd. Support above is free and never gated — this is an option, not the answer.

hMailServer Community

The community support forum for hMailServer — the free, open-source mail server for Windows and Linux — maintained by Progressive Robot Ltd. The software is AGPL-3.0 and stays that way; this is where it is discussed, debugged and documented.

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