Update available in Exchange Server 5.5 to control whether the Internet Mail Service suppresses or delivers NDRs

An update to Microsoft Exchange Server 5.5 is available that introduces a new feature that you can use to control how non-delivery reports (NDR) are processed by the Internet Mail Service. After you apply the hotfix that is described in this article, add the SuppressNDROptions registry entry to the following registry subkey. Then, set the SuppressNDROptions registry entry to the appropriate value, depending on whether you want the Internet Mail Service to suppress or deliver NDRs:

Hotfix information

A supported feature that modifies the default behavior of the product is now available from Microsoft, but it is only intended to modify the behavior that this article describes. Apply it only to systems that specifically need it. This feature may receive additional testing. Therefore, if you are not severely affected by the lack of this feature, we recommend that you wait for the next update that contains this feature.

To obtain this feature immediately, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

This hotfix requires Microsoft Exchange Server 5.5 Service Pack 4 (SP4).

Restart requirement

You do not have to restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

After you apply the hotfix that is described in this article, add the SuppressNDROptions registry entry to the following registry subkey and then set the registry entry to the appropriate value: To configure the way that the Internet Mail Service processes NDRs:

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIMC\Parameters
4. On the Edit menu, point to New, and then click DWORD Value.
5. Type SuppressNDROptions, and then press ENTER.
6. On the Edit menu, click Modify, and then follow these steps:
   • Set the Base type to hexadecimal.
   • • To enable this feature so that the Internet Mail Service does not deliver NDRs, type 1 in the Value data box.
     • To enable this feature so that the Internet Mail Service does not generate NDRs, type 10 in the Value data box.
     • To enable this feature so that the Internet Mail Service does not deliver any NDRs if an SMTP address is missing in the return address field, type 100 in the Value data box.
     Note If the SuppressNDROptions registry entry is either not present or if the registry entry is set to 0 (zero), the feature is not used.
7. Quit Registry Editor.
8. Restart the Internet Mail Service.

For more information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base: