So, you know people who send you email with return addresses like myDELETETHISPARTnameATSYMBOLexamDELETETHISTOOplePERIODcom? Or people who use software like TMDA, which makes you jump through hoops just to get email to them?
What's the word for making your correspondents in a communications medium responsible for dealing with your personal communications problems (spam, email worms, etc.)? Why don't people realize how rude and thoughtless it is to interfere with normal communications in this way?

Feh. 

(i'm with evan, i do view it as terribly rude. if somebody sends me email, the address better be valid as is, or i'll reply only once to tell the person to use a valid address or do without talking to me. i am tired of paying the price for spam over and over and over again.)
Such a list would be of no use to a spammer, though, because that's exactly the list that they'll be filtered against.
If they manage to get onto the list, then it's a problem. So you have to engineer an admissions process.
The process can't be too costly- otherwise, people won't get onto the list, and it'll be useless, since you'll be filtering out most of the world.
But it must cost something, I guess. Or maybe not. Perhaps very careful inference over the use of a list. I don't know.
But, I don't think it'd be of much use to have such a list, if you weren't on the list, and everyone off of it was ignored.