An e-mail filtering method and system that categorize received e-mail messages based on information about the sender. Data about the sender is contained in the message and is used to identify the actual sender of the message using a signature combining pieces of information from the message header or...http://www.google.com.hk/patents/US20050091320?utm_source=gb-gplus-share專利 US20050091320 - Method and system for categorizing and processing e-mails
