A method comprising: receiving an electronic message containing an attachment; performing an analysis of the attachment to identify one or more characteristics of the attachment based on a set of attachment analysis rules; and filtering the attachment in a specified manner based on the one or more attachment...http://www.google.com.tw/patents/US20060031340?utm_source=gb-gplus-share專利 US20060031340 - Apparatus and method for advanced attachment filtering within an integrated messaging platform
