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A fast, highly extensible, and event driven SMTP server
Haraka is a highly scalable node.js email server with a modular plugin architecture. Haraka can serve thousands of concurrent connections and deliver thousands of messages per second. Haraka and plugins are written in asynchronous JS and are very fast. Haraka has very good spam protection (see plugins) and works well as a filtering MTA. It also works well as a MSA running on port 587 with auth and dkim_sign plugins enabled. Haraka makes no attempt to be a mail store (like Exchange or...
Easy installation and configuration of a complete mail server
Sorry. VirtulMailServer is not anymore an opensource project cause it's been involved in a commercial project. VMS is now an app for Bulk Email and it comes with new fully working features. If you are interested in the project, please contact me: claudio.taccogna@gmail.com . See you.
Pulsar POP3 server (daemon) is easy to use with intuitive configuration file. It supports virtual (non-system) users and virtual hosts (IP based and user supplied). Can run from xinetd, inetd or standalone.