Rspamd is an advanced spam filtering system that offers powerful features to evaluate and filter messages effectively. It uses various methods such as regular expressions, statistical analysis, and URL blacklists to assign each message a spam score. Based on this score and the user's settings, Rspamd recommends actions for the MTA, such as passing, rejecting, or adding a header.

One of Rspamd's unique features is its web interface, which allows users to monitor and configure rules, scores, dynamic lists, scan and learn messages, and view scan history. The interface is fully functional, Ajax-based, and follows current web application standards. Another highlight is Rspamd's integration with popular mail transfer systems like Postfix, Exim, Sendmail, or Haraka.

Rspamd also offers an extensive Lua API, providing hundreds of Lua functions to create custom rules for efficient spam filtering. Additionally, Rspamd supports content scan features that allow it to search for specific patterns in messages, including regular expression filtering, fuzzy hashes, DCC checks, and chartable module. For policy checks, Rspamd supports SPF and DKIM validation, DMARC implementation, ARC forwarding, and whitelists.

These features help define policies for sender's IP address, URLs, and the message itself, ensuring reliable filtering. With Rspamd, users can enjoy a comprehensive spam filtering solution that combines advanced techniques and user-friendly interface