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
Backup Emails from 99+ Email Clients for Free with Just Few Limitation
Free Email Backup Software | Email Backup App for Android
Fast and easy-to-use webmail front-end for your existing mail server.
Simple, modern & fast web-based email client
imap cleanup & command line tool
an 'auto-reply' bot for your mail server
To synch and encrypt all sorts of data across different sources
javascript to convert thunderbird/seamonkey filters to sieve rules
Webkosa is the open source edition of Webcrossing.