Some fake guy trying to steal Diablo accounts? What are the odds of that?
1. What kind of idiot would want to steal a DIABLO account? Diiiaaaablooooo. As in the game that is Diablo that is lame.
2. Considering Blizzard's reputation this is probably an evil scheme to hypnotize you into buying a "premium" (READ: Exactly the same but all your characters start at lv. 5 and you can play as a were-gnome. And it costs 3 times as much.) account and then putting spyware on your computer to steal all your Cyberspace Studio secrets!
We must make a virus which attacks the sender of the email and gives us all of THEIR secrets.
Oh wait, WE DON'T HAVE A CODER.