Take back control of your email with this mail server in a box
Insular email distribution - mail server as Docker images
A fast, highly extensible, and event driven SMTP server
Mail Proxy Applications
Fast and easy-to-use webmail front-end for your existing mail server.
Simple, modern & fast web-based email client
Easy installation and configuration of a complete mail server
an 'auto-reply' bot for your mail server
To synch and encrypt all sorts of data across different sources
Synology package to hibernate while running Mail Station & Server
Debian Mailserver
javascript to convert thunderbird/seamonkey filters to sieve rules
Webkosa is the open source edition of Webcrossing.