There are multiple test emails that are sent out before the send, but sometimes in the final file, where the data is stored, the columns accidently get switched around or the proof readers were blind to parts of the test email that they're used too, ie. the account information.

Hopefully he will have another co-worker soon! After I left for another department the next person didn't last very long. The email department has been a 2 person department since Nov 2010.