When I send a email to a internal address I know doesn't exist, I don't recieve an NDR for that failed email; but the PostMaster account i setup to get all NDRs copied to it does get the NDR. The only reason I even noticed this was going on was because I tried to email a distribution group that is locked down and I didn't have rights to send the message... then I saw the NDR pop into my PostMaster account and thought "wtf?". Any ideas? We have a Exchange 2007 SP2 CCR cluster running on Windows 2003Blair

Check Message tracking. Does it show the NDR is being generated to your account? Any transport rules dropping the NDRs?Undo the copying to the Postmaster account and test. ( Why the need for that anyway?)

Yes the dump the configuration of HT server and see Get-TransportConfig | flVinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

Hi,Yes. And do you also use internal address to send to internal address? Or use external address to send mail?You can find helpful information, How to Copy NDRs to a Mailboxhttp://technet.microsoft.com/en-us/library/bb400930.aspxFrank Wang