Schwartz (clinical decision making, University of Illinois) clarifies the installation, configuration, and use of the SpamAssassins rule-based system that analyzes email and compares different parts of messages with a large set of rules. Writing with Unix system administrators in mind, he also explains how to integrate SpamAssassin with the sendmail, Postfix, qmail, and Exim mail transport agents. Annotation ©2004 Book News, Inc., Portland, OR