I have done this and still receiving:
ERROR: No messages found with Original Message ID: <342511711.1185.1704920872666@localhost>We see the original message coming into our SMTP servers at 21:07:53. I see the MDN Processed and MDN Dispatched going out at 21:07:54 and see SMTP responses from the ETT servers of 250s and 354s (250+2.6.0+Message+received).
The messages have the details in the MDN (Dispatched for example)
Disposition:automatic-action/MDN-sent-automatically;dispatched
Original-Message-ID:<342511711.1185.1704920872666@localhost>