I'm wondering, would it be useful to have a plugin that penalizes messages with many spelling mistakes?
No, it's been suggested before, and tested.. the FP rate was rather high. Bear in mind all the "legitimate" email from AOL users that can barely spell their own names, and choose to use extensive chat-room shortcuts and slang in their emails.... whut u doin l8er?
Search the archives.. Someone comes up with the idea at least twice a year.