An Improved Anti-Spam Method TOMO Based on Challenge-Response Technology
Peng Li, Miao Liu, Fan Zhang, Chunming Tang · 2009
After an analysis of some critical limitations of current challenge-response based email anti-spam techniques, the paper describes a solution to the deadlock problem and a way to dramatically improve the speed of the challenge-response process. It involves generating and maintaining email lists of trusted senders, and a backward-compatible extension to the SMTP protocol. In the end, the paper describes a realization of the above techniques.