A method for detecting undesirable e-mails is disclosed. The method includes collecting a plurality of undesirable e-mails, arranging the plurality of undesirable e-mails into a plurality of groups and generating, for each group, at least one token, thereby producing a plurality of tokens for the plurality...http://www.google.com.au/patents/US20060149820?utm_source=gb-gplus-sharePatent US20060149820 - Detecting spam e-mail using similarity calculations
