Microsoft KB Archive/238429

= Messages autoforwarded to an invalid internet address appear to create a looping message in Exchange =

Article ID: 238429

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange 2000 Server Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition
 * Microsoft Exchange Server 5.5 Service Pack 1
 * Microsoft Exchange Server 5.5 Service Pack 2
 * Microsoft Exchange Server 2003 Enterprise Edition
 * Microsoft Exchange Server 2003 Standard Edition

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This article was previously published under Q238429



IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
Messages appear to be looping between Exchange Server and the Internet through the Internet Mail Service.



CAUSE
Messages autoforwarded to an invalid Internet address appear to create a looping message.



Exchange Server 5.5
A feature has been added to Exchange Server 5.5 to prevent autoforward rules from running against any message that contains an empty RFC 821 FROM field. To enable this new feature on a mailbox server, add the Disable Auto Forward On Empty RFC821From registry value and set the value to 1.

To set this value:

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.

 Start Registry Editor (Regedt32.exe). Locate and click the following key in the registry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\ParametersPrivate

 On the Edit menu, click Add Value, and then add the following entry:

Value name: Disable Auto Forward On Empty RFC821From

Data type: REG_DWORD

Value data: 1 or 0 (default=0)

1 disable auto forward

0 enable auto forward

 Click OK. Quit Registry Editor.</ol>

The feature is included in an information store fix that also requires directory build 2600 or later. This feature is available in the latest service pack for Exchange Server version 5.5. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

191014 How to obtain the latest Exchange Server 5.5 service pack

The English version of this feature should have the following file attributes or later:

Component: Information Store

This feature was first included in Exchange Server 5.5 Service Pack 3.

Exchange 2000 Server and Exchange Server 2003
<ol> Start Registry Editor (Regedt32.exe).</li> Locate and click the following key in the registry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\ParametersPrivate

</li> On the Edit menu, click Add Value, and then add the following entry:

Value name: Disable Auto Forward On Empty RFC821From

Data type: REG_DWORD

Value data: 1 or 0 (default=0)

1 disable auto forward

0 enable auto forward

</li> Click OK.</li> Quit Registry Editor.</li></ol>

<div class="workaround_section">

WORKAROUND
Make sure that the autoforwarding rule contains a valid Internet address.

<div class="status_section">

STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

<div class="moreinformation_section">

The registry entries that are mentioned in the "Resolution" section do not work for the Folder Assistant. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

903289 How to create a rule to enable automatic replies to users who post messages to a public folder in Outlook 2003

Keywords: kbhotfixserver kbbug kbfea kbfix kbqfe KB238429

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