How to Stop “Purchase Order Communication Failed” Emails for Suppliers Using Print Method

We have enabled purchase document communication emails to suppliers using the profile option PO_CONTROL_SUPPLIER_COMMUNICATION. For suppliers whose email address is configured at the supplier site, email notifications are sent successfully. For suppliers where Print is set as the communication method, we are receiving FYI: Document (Purchase Order) Communication Failed notifications. How can we stop these emails from being sent by the Oracle system? If this is not possible, is there a way to customize these notification emails?