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Abstract

Like so many other people out on the Internet, I get unsolicited commercial email or "spam". Until recently, I could handle spam by just deleting it or using email aliases. Unfortunately, my server was rendered useless by a spam attack launched by an unknown spammer. The experience forced me to improve my spam defenses. In two articles, I will share the research and results of my effort to implement an anti-spam system. In this first installment, I will briefly cover various anti-spam systems and the system I chose, a network level defense. In the next installment, I'll dig deeper into the details of an implementation with qmail. (The information is general enough that it could be applied to other email systems such as Postfix or Sendmail.)