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Unsolicited commercial email, commonly known as spam, has become a pressing problem in today's Internet. This paper re-examines the architectural foundations of the current email delivery system that are responsible for the proliferation of email spam. They argue that the difficulties in controlling spam stem from the fact that the current email system is fundamentally sender-driven and distinctly lacks receiver control over email delivery. Based on these observations they propose a Differentiated Mail Transfer Protocol (DMTP), which grants receivers greater control over how messages from different senders should be delivered on the Internet. In addition, they also develop a formal mathematical model to study the effectiveness of DMTP in controlling spam.
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