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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...

KumoMTA is an Open-Source, enterprise-grade email message transfer agent (MTA) software for sending high-volume, business-critical emails. KumoMTA is typically chosen by high-volume email users looking to replace PowerMTA, Momentum, or traditional Open Source MTAs. KumoMTA offers high-performance message relay to the tune of millions of messages per hour per server, combined with extreme flexibility and configurability through its use of a Lua scripting engine for configuration and message management.

Jpxx is a lightweight ESMTP/POP3 java mail server. After v0.03, JMS can be run with a separate servlet engine (or application server) such as Apache Tomcat or Resin. It is used to run as a plugin.

KQ-Mail is a modular SMTP mail server using kernel queues to communicate between modules. In it\'s basic mode it is ideal to sit between the internet and your primary mail server to provide a buffer and or a SMTP RFC enforcement engine