I thought deleting email would be good, but then I realized they'd start sending tells which are more annoying.
Chat and email should only be available to credit card subscribers. If they are spammers, make all thier email and chat get diverted to a special dev/moniter account, without them knowing there has been a diversion. Any other account with the same credit card name will be immediately treated the same.
City of Heroes gets thier subscription money, they think they are spamming, and everyone gets left alone.
And to report those spam happy losers, the multi petition/ignore/delete button is genius.
Evil. Yes I know.