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Welcome to the Gromox project webpage

Gromox is the central groupware server component of grommunio. It is capable of serving as a drop-in replacement for Microsoft Exchange. Connectivity options include RPC/HTTP (Outlook Anywhere), MAPI/HTTP, IMAP, POP3, an SMTP-speaking LDA, and a PHP module with a MAPI function subset. Components can scale-out over multiple hosts.

Gromox is modular and consists of a set of components and programs to provide its feature set. This repository includes a number of manual pages, for which a rendered version is at

Gromox relies on other components to provide a sensibly complete mail system,

The grommunio Appliance ships these essentials and has a ready-to-run installation of Gromox.

Support is available through grommunio GmbH and its partners. See for details. A community forum is at

The source code repository and technical issue tracker can be found at

Latest Release 2.28 ⬇