How to Remove Purchase Order attachment from order confirmation request emails sent to Supplier

To my understanding, a confirmation request email is sent to the supplier when E-mail is the chosen Communication Method for a purchase order as in Screenshot 1. When the email is sent to the supplier, the order is attached as a file as shown in Screenshot 2. However, my client's security policy prohibits sending unencrypted files to suppliers. They would like to have the order document removed from the confirmation request email. Is there any way to remove the order file from the e-mail?

Thank you.

Screenshot 1

Screenshot 2