Here's another suggestion for a built-in anti-spam system: If a character gets blacklisted by five recipients of tells who are not in ls/fc/friends list in a day, the character who sent the tells loses the ability to send tells to people not in ls/fc/fl for a week. It's a community vote system that gets unwanted communications silenced quickly. I don't see how it could be abused. Such a system could cut down the RMT tells by a large percentage.