CAPTCHA Idea: Checkbox Grid

[scotch]

Sure they do... using bot managed accounts on real large email sites is still one of the most popular methods, it helps them get past filters. Obviously nobody can blacklist hotmail or yahoo mail servers, because most mail coming from them isn't spam, so it's not as immediately suspicious. Sending millions of spams out from your web server is just going to get it blocked. Getting your botnet to spam through yahoo accounts is much more sustainable. People rent out their botnets to spammers for that purpose.

[TerranRich]

Sorry, I figured the way I witnessed was the easiest, and therefore only way. Damned, dirty spammers!