Beware! If you receive an email from our 'accounts receivable' dept. please report and delete the email.
It is a very obvious scam to try and extract a payment from you. Of course you won't fall for it, but just to be on the safe side, delete the email and if possible report to your ISP as fraud.
We do not even have an accounts receivable department, we always address you by your name and will never ask you to pay any other way than through our known bank account which is on the invoice. I hope they get whoever is sending this crap - may they rot in hell.
Just to make sure, here is a picture of the email (click to enlarge):