Phishing
I just had an e-mail from "Nat West" about my credit card bill, I don't have a credit card so I phoned them. They asked me to forward it to them as it was definitely fraudulent, trying to get me to fill in account details.
I didn't open it, just sent it to their Phishing dept. and changed my e-mail passwords. Hope that's sufficient!
Just be on the look out for these!