Non-Delivery Reports To Postmaster account Non-Delivery reports not sent to Postmaster Checking the box under domain properties: Copy local failure reports for this domain to postmaster only sends errors to the Postmaster account that are relatively infrequent such as:

• Max Mailboxes Exceeded
• Mailbox Directory Inaccessible
• Mail System Full
• Message File Missing
• Quota Exceeded
• Unknown Reason

If you wish to notify the Postmaster account of all invalid address attempts, follow the instructions below: WARNING!! Incorrectly editing the registry can damage the server, please be sure you know what you are doing

1. Open Regedit or Regedit32
2. Locate: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SMTPRA\Parameters
3. Right click - Add Reg_DWord and enter Reg name: NoMailboxCheck
4. Double click on the new entry and enter the number 1 as the value.
5. Close Regedit/Regedit32

This setting allows SMTPRA to accept the inbound address regardless; a non-delivery report will be generated later by SMTPDA, and this will be copied to the postmaster if you check the above box. The disadvantage of this is that you are burdening MailSite with a lot of unnecessary processing.