once upon a time, probably exchange 2003 and 2007, I used to be able to see copies of the NDRs that internal users received when email failed to outside email address, usually due to type in the email address.
I have been asked to set that up again.
so correct me if I am wrong , but to setup the postmaster mailbox to receive a copy of any NDR the users would receive, I just need to configure the external postmaster address? (currently it is blank) using powershell command below?
Set-TransportConfig -ExternalPostmasterAddress postmaster@mydomain.com
also, if that works, do the users still get a copy of the NDR?