“The first step to fighting spam is knowing how to recognize it and, by extension, write code that recognizes it. Unfortunately, spammers realize this and work hard to circumvent detection. This chapter details the many ways that spam filters recognize spam, as well as the ways spammers have gotten around these filters.
It is easy for a person to look at a piece of email and say, "This isn't something I asked for. It looks like an advertisement, and I don't want it, so it must be spam." But although it is easy for humans to recognize spam, it is much harder for software to recognize it. And, after all, the point of spam-blocking software is to eliminate the need for humans to recognize spam.…”
- Connection Behavior
- Relaying through MX Servers
- Falsifying the Envelope Sender Address
- Disguising the Subject: Header
- Camouflaging the HTML Body
- Attempting to Fool Signature Detectors
- Unnecessary Encoding
- Grokking the Site
- Loose Ends
- Think Like a Spammer
http://www.informit.com/articles/article.asp?p=376874
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