Rudimentary spam filtering saved email long ago when spams were focused on a few niches like pharmaceutical or Nigerian scam. It wouldn't be efficient today wi

Rudimentary spam filtering saved email long ago when spams were focused on a few niches like pharmaceutical or Nigerian scam. It wouldn't be efficient today with spam being more more diverse and often hardly distinguishable from legitimate emails. A lot of spam nowadays is like forced advertising, by opposition to plain scam and dodgy stuff.