A spam rejection scheme during SMTP sessions based on layer-3 e-mail classification

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• 作者：Muhammad N. Marsono ; M. Watheq El-Kharashi ; Fayez Gebali
• 关键词：Layer-3 spam detection ; Markov chain analysis ; SMTP rejection ; Spam control
• 刊名：Journal of Network and Computer Applications
• 出版年：2009
• 出版时间：January 2009
• 年：2009
• 卷：32
• 期：1
• 页码：236-257
• 全文大小：851 K

文摘

This paper proposes a scheme that rejects spam e-mails during their simple mail transfer protocol (SMTP) sessions. This scheme utilizes a layer-3 e-mail classification technique, which allows e-mail classes to be estimated before the end of SMTP sessions at receiving e-mail servers. We analyze the proposed scheme using discrete-time Markov chain analysis under varying e-mail traffic loads and service capacities. This paper also considers the effects of e-mail retransmission and illegal spam relaying by zombie systems on the performance of the proposed scheme. Results from our analysis show that e-mail server loading decreases by using the proposed technique. This allows the reduction in non-spam e-mail queuing delays and loss probability. Our scheme also protects e-mail servers from being overloaded by spam traffic and, if performed collectively over the Internet, it is capable of performing outbound spam control.