Randy,
I am assuming you have the receiving system ackowledging each message.
So what I might try is: put your proc in the TPS Inbound Reply UPoC specified at the Outbound Tab of the Outbound thread. Then count the number of replies. Once you have received three replies, you know the three messages were delivered and the receiving system acknowledged them.
Make sure you define your counter as global.
Jim Kosloskey
email: jim.kosloskey@jim-kosloskey.com 30+ years Cloverleaf, 61 years IT – old fart.