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 I personally find that greylisting + greytrapping removes the obvious ones, and saves a lot of electricity plus wear and tear on the poor servers doing content and header filtering.
My greytrapping and misc retrospective is hopefully useful to others too: Eighteen Years of Greytrapping - Is the Weirdness Finally Paying Off? https://nxdomain.no/~peter/eighteen_years_of_greytrapping.html - with references at the end.
dan slimmon
Peter N. M. Hansteen
Karen jacqueline