Mailcow
A self-hosted Communication & Social app you can run on your own server.
Mailcow gives you a self-hosted communication platform: one you deploy yourself, on a home server, NAS or VPS. Self-hosting it means no per-user subscription and no third-party cloud holding your information.
The project is developed in the open via GitHub, where it has earned 13.4K stars from the community. Repository activity was last recorded on Aug 18, 2026, and the project is classed as actively maintained in our snapshot.
Before you switch
Communication tools only work if your people can reach them. Check guest access, mobile apps, and federation or bridging support before migrating a community. Self-hosting gives you the data and the rules, but someone has to own updates and moderation.
Like every project listed on SelfHosted, Mailcow is developed in the open — you can read the code, follow development, and even contribute. Check the system requirements and the project’s own documentation linked on this page before installing.