Date Added: Mar 2012
Unsolicited Bulk Emails (also known as Spam) are undesirable emails sent to massive number of users. Spam emails consume the network resources and cause lots of security uncertainties. As the authors studied, the location where the spam filter operates in is an important parameter to preserve network resources. Although, there are many different methods to block spam emails, most of program developers only intend to block spam emails from being delivered to their clients. In this paper, they will introduce a new and efficient approach to prevent spam emails from being transferred.