When a Microsoft Windows 2000-based computer sends a non-delivery report (NDR) to the sender of a large e-mail message, the whole e-mail message is attached to the non-delivery report (NDR). This problem occurs when the computer is also running Microsoft Exchange 2000 Server with Service Pack 2 or later versions.

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Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

No prerequisites are required.

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 install this hotfix

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

After you install this hotfix, follow these steps to create the MaxDSNSize registry entry and to enable the hotfix:

1.	Click Start, click Run, type regedit32, and then click OK.
2.	Locate and then click the following key in the registry: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\SMTPSVC
3.	On the Edit menu, point to New, click Key, add the following registry key, and then click OK: Key name: Queuing Class: Leave the class blank
4.	On the Edit menu, point to New, click DWORD Value, and then add the following registry value: Value name: MaxDSNSize Data type: REG_DWORD Radix: Decimal Value data: This value is the size limit in bytes. Messages that are larger than this value and that generate an NDR do not return attachments or full message properties.
5.	Restart the SMTP service for this registry change to take effect.

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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This hotfix lets you remove the attachments from an NDR. This hotfix also lets you limit the maximum size for NDRs. If you install and then enable this hotfix, you can save server and network resources. However, there are drawbacks to this implementation of Simple Mail Transfer Protocol (SMTP) attachment removal. For example, you experience the following behaviors after you enable this hotfix:

•	The details that are used to display the notification in the preview pane are removed.
•	The sender of the message cannot use the Send Again option.

If the sender of the message tries to use the Send Again option from the NDR message, the sender of the message receives the following error message: However, the sender of the message cannot resend the message even by using the method in the error message.

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For additional information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

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