I have a similar question. However, my email has not changed and it only occurred today on one customer's offline credit card transaction. Two previous orders went through normally, but on this one, the order confirmation and middle digit cc info never came through my email. I called the customer and got his info by phone. His order is in my admin account as pending, but I can't figure out why it didn't come thru to my email. The customer said he completed checkout and got an email about his order going through.
Is there anywhere/anything I can check on to see that it doesn't happen again?
Thanks for any help!
p.s. I have version Zen Cart 1.3.8a