System and Method for Detecting Email Spammers

Abstract

A system and method for detecting Email spammers from unknown SMTP Clients using the unknown SMTP Client's SMTP traffic information e.g. byte size and variability data. The system and method includes a byte size and variability traffic flow model and a classification system. The traffic flow model may be based upon a standard deviation of byte size and variability of traffic flows for a plurality of legitimate SMTP Clients and for a plurality of Spammer SMTP Clients. The classification system then classifies an Unknown SMTP Client as an Email Spammer based on a comparison between the byte size and the variability of the Unknown SMTP Client's traffic flows with the byte size and variability traffic flow model.

Dependencies are inferred from the claim text.