The most popular alternative is mailcow: dockerized, which is both free and Open Source. If that doesn't suit you, our users have ranked 4 alternatives to Mailu so hopefully you can find a suitable replacement. Other interesting Mailu alternatives are Mail-in-a-box (Free, Open Source), iRedMail (Freemium, Open Source) and Modoboa (Free, Open Source).
- mailcow is a mail server suite based on Dovecot, Postfix, SOGo, Rspamd and other open source software, that provides a modern Web UI for administration.
- Take back control of your email with this easy-to-deploy mail server in a box. Mail-in-a-Box turns a fresh cloud computer into a working mail server.
- A fully fledged, free email server solution, an open source project (GPL v2).Use official binary packages from Linux/BSD distributions, with both i386 and x86_64 support.
- Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface . It provides useful components such as an administration panel or a webmail.