Mailing spam and block player sugestion
Yeah, this is ridiculous. A popup box about not being able to contact someone should be perfect too.
Personally I think banning China would solve a ton of issues (and I say this as someone with Chinese relatives on both sides of the family). They can have their own servers. Every city is a constant stream of spam already. I have to block a ton of frickin’ goldsellers to even read anything other people say before it scrolls off the page. This is like WoW at its worst. Ban China. Ban the hell out of it. I don’t care how unfriendly it seems.