Any buyer or purchase coordinator would be delighted to find out how easy it is to mail a purchase order to the correct email address of the vendor, right from Dynamics 365 for Operations. The good news is that it is indeed very easy. But there is potential for some confusion in the setup of the "primary contact" email addresses. Let's start at the beginning.

When I create the PO, I can select a contact. This contact will bring its email address into the Purchase order header. That is nice, but it gives the user the wrong impression.