I was doing some more research and captured the query that the MTA is
periodically running to get the data.One of the critical part of the SQL
is the iState IN (51,55,61,62,71,81) If I compare these integer with the
deliveryState enum the values are as (Start Pending, In Process, Retry
Pending, Retry In Process, Pause Requested, Stop Requested). None of
these values look promising from the point of view of my error. I
checked the DB and the status of the deliveries in stuck stage is 15
(Target R...