# About the Commtouch Outbound Spam Protection Solution for Plesk

Every massive email-borne outbreak, spam or malware, can be identified by one or more recurrent message patterns. Even when spammers intentionally compose messages within the attack differently in an attempt to evade lexical analysis-based filters, patterns still exist to enable these messages to be identified as spam. Commtouch RPD™ technology detects these patterns as it analyzes data gathered from characteristics of Internet email traffic.

By identifying these message patterns, RPD is able to identify and detect massive email-borne threat attacks with a high level of accuracy. Commtouch RPD™ technology was designed to detect spam or malware that is written in every language and in all message-formats (text, HTML, images, etc.). RPD is hosted at the Commtouch Datacenter, a global network of servers that provide unparalleled email, web, and antivirus security.

The Commtouch Datacenter spans several separate sites for failover and load-balancing purposes. ctasd is designed with a built-in automatic failover mechanism in case the last-used Datacenter is not available. When integrated as a total email security service, Commtouch provides comprehensive spam and virus protection, identifying both existing and known malware threats as well as those just emerging but as yet unidentified viruses.

Note: In the current version of Commtouch for Plesk, both Qmail and Postfix MTAs are supported.