Are you truly still using Zen Cart version 1.3.7?
If so, about the only help that can be offered really is to address the specific question, follow the code for where email is sent when placing an order. Identify what values must be met to get what action. In more recent versions, there has been an admin switch added to the configuration->email settings option to identify that admin is to receive those emails or not and an email address can be entered.
Other thing is though, if the site really is of that old version, would highly recommend upgrading as more than likely if this email condition has stopped working, there is a real and credible reason why...
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