Haraka is a highly scalable Node.js SMTP server with a modular plugin architecture. It handles thousands of concurrent connections and delivers thousands of messages per second. Haraka and its plugins ...

Citadel is an easy, versatile, and powerful email and collaboration suite that utilises a “rooms”-based architecture, allowing for a most unique workflow. Its easy installation and simple and ...

E-mail is old and complex. It’s the oldest still-recognizable component of the Internet, with its modern incarnation having coalesced out of several different decades-old messaging technologies ...