Within exchange there is a transport rule which is configured as “Any Emails messages sent to the specified User, Copy the message to a distribution group” and this all works fine except for “Non delivery reports”.
This user sends out mailshots and sometimes gets quite a few NDRs. All other email is fine the group receives a copy but NDRs are only received by sender.
I have tried disabling the Transport rule and using the forward function within the Mail Flow Setting of the users properties, but there is no change, exactly the same thing happens.
Does anyone know the reason for this and how I can fix?