It's been a while I'm trying to understand how to perform a Delivery Notification on a BizTalk Direct Logical Send Port. All the samples and the posts around the issue never mentioned sending the message directly into the MsgBox. They all talked about the guidance of performing the ACK/NACK on a Specify Later, Specify Now or Dynamic port configuration - not Direct. Well here is how I did it on a Direct style: 1. Assuming the message I'm trying to send (and check for delivery) is called...