This reminds me of the early days of SpamAssassin. It used to have a fairly simple set of regexes that would catch a great deal of spam. Then as it became popul

This reminds me of the early days of SpamAssassin. It used to have a fairly simple set of regexes that would catch a great deal of spam. Then as it became popular, spammers used it themselves to pre-filter and tweak their messages until they passed the filters.