自訂智慧型郵件篩選器的回應訊息

在 Exchange Server 2003 SP2 上的智慧型郵件篩選器可以自訂回應字串，也就是要回應給寄件者的未傳遞報告 (NDR) 上的訊息，預設是 550 5.7.1 Requested action not taken: message refused。

如何自定回應字串
1. Open a registry editor, such as Regedit.exe or Regedt32.exe.
2. Navigate to: HKLM\Software\Microsoft\Exchange\ContentFilter
3. In the right task pane, right-click the CustomRejectResponse value and select Modify.
4. Enter the string value you want to use as the custom response, starting the string with 550 5.7.1. For example, you can enter 550 5.7.1 Domain not an allowed sender to set the string to a valid string that will be appended to the NDR.
5. Save the changes, exit the registry editor, and restart the SMTP service for the changes to take effect.