I remember seeing that posted often, back when email spam was a big problem, and it always bothered me. Whenever people were discussing possible fixes, someone would post that checklist -- and you could always find some way to apply the checklist, even if it was just by invoking the generic "Eternal arms race involved in all filtering approaches" objection. Every sophisticated person knew that the email spam problem was intractable. Your inbox would always be full of spam, and it was considered foolish to think otherwise.

I haven't had much spam hit my inbox lately, though. So much for the checklist.