Got this email today. If you are trying to scam at least update from 4.3.

Ugh.. phishers... the majority of our communication is going to be directly through battle.net. Although  Blizzard  sometimes send out promotional emails, it's best to err on the side of caution if you ever receive something like this, and forward it to hacks@blizzard.com. I'd also like to recommend the free mobile authenticators which are easy to set up, and are a great way of protecting your account against those who would try to steal it from you. Hope this helps!

The way I know it's a scam right off the bat is how the url starts. "www." = scamming no good piece of shit, "us. or eu."= the glorious company that is Blizzard