I have an exchange server that got hit by some spammer. Not quite sure the details of how but what i ended up with was several hunderd NDR messages that could not be delivered so they sat in the queue. They all had an error similar to this:
Last Error: 450 4.1.2 <email@example.com>: Recipient address rejected: Domain not found
Since the domains are bogus how do i turn off these NDR's for domains that are not on our server?
This is an Exchange 2010 and we have around 25 domains on the box.
For now i turned off NDRs all together, i realize this is not permited by RFC however it is killing the performance on the box.