Mailcow provides a robust, scalable email server for your whole organisation. Individual users get full control of their own mailboxes, with loads of filtering, blocking, alias addresses, and other options.

There's also a built-in webmail system which allows managing forwarding and vacation mail as well as folder management, among other things.
It also adheres to open standards for interoperability like secure SMTP, IMAPS, POPS, TLS, Caldav, and Carddav, so you can continue using your preferred email client app.

Mailcow provides active spam blocking and virus scanning to protect email recipients, and automatically blocks known bad actors and those trying brute-force attacks on the system.