Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of
rules including regular expressions, statistical analysis and custom services
such as URL black lists. Each message is analysed by Rspamd and given a spam score.
According to this spam score and the user’s settings, Rspamd recommends an action for the MTA to apply to the message, for example, to pass, reject or add a header. Rspamd is designed to process hundreds of messages per second simultaneously, and provides a number of useful features.
A good starting point to study how to install and configure Rspamd is the quick start guide.
Rspamd is packaged for the major Linux distributions, and is also available via FreeBSD ports, NetBSD pkgsrc and OpenBSD ports.
You can also watch some videos about Rspamd.
Rspamd is shipped with various spam filtering modules and features enabled just out of the box. The full list of built-in modules could be found in the modules documentation.
If that is not enough, Rspamd provides an extensive Lua API to write your own rules and plugins.
This project is licensed under the Apache 2.0 License