When an order is placed an email is generated. We've had an issue with our cart. The employee who was to be managing it routed all the mails to their junk. What we need to be able to request a read receipt for each email that is sent so that we know it was opened. I know that this can be done by adding a line or two to the file that sends the email. What I need to know is where in Zen Cart to put it.

Once it's done, I'm quite happy to offer it as a contribution.