amavis
Modoboa
https://modoboa.org/en/
Open Source email server
Regain your independence and protect your privacy by installing your own email server. It takes less than 10 minutes!
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 and webmail.
Added 1 year ago
Probesys/agentj: AgentJ is a free software anti-spam solution with human authentication and admin panel
https://github.com/Probesys/agentj
This is the Docker stack to set up a fully functional AgentJ antispam system at a glance.