There's this myth that automated spam detection is hard because spammers are all very clever masters of disguise.

No. Spammers are stupid as a shoe. They have dog shit for brains.

Automated spam detection is hard because the line between spam and "legitimate" marketing activity is a fiction.

@danslimmon It's a cat and mouse game. Every successful spam detector becomes a useful pass/fail test for future spams. So no matter what blocking path you run, they always find a new route.