Mailcow
Mailcow is free software that lets you run your own email server for your own web address, using Docker so the setup is packaged in containers. It is meant for people or organizations who want to host their own email instead of using a large provider.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
How to help
AI contributionsNot stated
The project has not said how it feels about AI-written contributions. Maintainers can set this by claiming the listing.