[AChimp]

A lot of e-mail filters use small AI routines now to filter out junk from "legitimate" e-mails. By filling an e-mail with misspellings and random words, the spammers can circumvent simple word scanners and more advanced filters by fooling them into thinking it's something legitimate (or defaulting to "let the user decide because I can't").

That's why you'll see e-mails with subject headers such as "Gaint C. ocks!!! asdfaiijgalkjdfa."