Similar response as provided to the parallel thread: http://www.zen-cart.com/showthread.p...stomer-details

Pretty doubtful that the thread will be deleted, why not finish it off with what has been found/determined.

I will say that ihave seen the email error before when someone (bots or people) was trying to use say the contact_us page to send spam. It didn't lead to a checkout issue, but there was sufficient tracking information to identify that a real person was not doing all of the work.