I think you're misreading the article. They're not claiming I invented spam filtering, just one particular algorithm that worked. There were effective spam fi

I think you're misreading the article. They're not claiming I invented spam filtering, just one particular algorithm that worked. There were effective spam filters before "A Plan for Spam," most notably CRM114, but that worked differently. And there were a couple papers published that had the words "Bayesian" and "spam filter" in the title, but the algorithms they described were different, and in fact quite useless.