Nondelivery reports (NDRs) are often helpful when troubleshooting delivery problems because they usually contain the specific error that caused the delivery problem. Follow these steps in Exchange 2000 to send NDR notifications to an SMTP address:
The address you specified in Step 3 now receives notification of all NDRs.
If you want more than one person to receive NDR notifications, create a distribution group and populate it with the people who need to receive NDR notifications. Enter the distribution group's SMTP address in Step 3.