It’s been nearly a decade since spammers and their enemies begun evolving competitively. As with the classic cheetah/gazelle model originally formulated by Darwin, each time one group becomes a little faster or more agile, its adversaries develop traits for outwitting and outrunning it.
In addition to wasting people’s time with unwanted e-mail, spam also eats up a lot of network bandwidth. Consequently, there are many organizations, as well as individuals, who have taken i…