It's an obvious scam email. I get one or two like that every day (purporting to come from various companies and official bodies) sent to my old (ISP-based) email address. I simply ignore them.
I nearly fell for one purporting to come from the Dartford Crossing people though, as I have got an account set up there (so that my toll fees are automatically taken from my bank account). I was just about to open the attachment when I remembered that the email address I've got registered for the Crossing wasn't the one that the email had been sent to!