@@ -314,6 +314,7 @@ Comparison of NoSQL servers: http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-v
*Security tools.*
* [Fail2Ban](http://www.fail2ban.org/wiki/index.php/Main_Page) - Scans log files and takes action on IPs that show malicious behavior.
+* [SpamAssassin](https://spamassassin.apache.org/) - A powerful and popular email spam filter employing a variety of detection techniques.
## SMTP
*SMTP servers.*
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