Forwarded message may be discarded as a duplicate in Exchange Server 5.5 or in Exchange Server 2003

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Article ID: 823799 - View products that this article applies to.
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
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SYMPTOMS

Some messages may not be delivered when they have been forwarded from one recipient to another recipient in your Microsoft Exchange Server 5.5 or Exchange Server 2003 organization.

CAUSE

This problem may occur if all the following conditions are true:
  • The message is originally sent from the Internet to an Exchange Server 5.5 recipient.
  • The message is forwarded by the Exchange Server 5.5 recipient to another Exchange Server 5.5 recipient.
  • The message contains a "Message-ID" field in the SMTP header that is not RFC-compliant. For example, the problem can occur if the "Message-ID" field is very long.
The problem occurs because the Exchange Server 5.5 store incorrectly detects the forwarded e-mail as a duplicate.

RESOLUTION

Exchange Server 2003

Service pack information

To resolve this problem, obtain the latest service pack for Microsoft Exchange Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
836993 How to obtain the latest service packs for Exchange Server 2003

Exchange Server 5.5

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:
http://support.microsoft.com/default.aspx?scid=fh;[LN];CNTACTMS
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). If you have installed a previous version of this hotfix, remove the previous version of the hotfix, and then update your computer with the new, updated version of this hotfix.

Restart requirement

You must 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 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.
   Date         Time   Version            Size    File name
   --------------------------------------------------------------
   23-Nov-2004  03:00  5.5.2658.25       496,400  Mdbmsg.dll       
   23-Nov-2004  03:03  5.5.2658.25     2,635,536  Store.exe


To use this hotfix, you must change the registry.

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.

To enable the hotfix for the private store, follow these steps:
  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate and then click the following key in the registry:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersPrivate
  3. On the Edit menu, point to New, and then click DWORD Value.
  4. Type Disable Duplicate Detection Over 255 bytes for the name of the DWORD, and then press ENTER.
  5. Right-click Disable Duplicate Detection Over 255 bytes, and then click Modify.
  6. In the Value data box, 1 to enable the hotfix, and then click OK.
  7. Quit Registry Editor.
To enable the hotfix for the public store, follow these steps:
  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate and then click the following key in the registry:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersPublic
  3. On the Edit menu, point to New, and then click DWORD Value.
  4. Type Disable Duplicate Detection Over 255 bytes for the name of the DWORD, and then press ENTER.
  5. Right-click Disable Duplicate Detection Over 255 bytes, and then click Modify.
  6. In the Value data box, 1 to enable the hotfix, and then click OK.
  7. Quit Registry Editor.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This problem was first corrected in Microsoft Exchange Server 2003 Service Pack 2.

MORE INFORMATION

For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:
817903 New naming schema for Exchange Server software update packages

Properties

Article ID: 823799 - Last Review: October 25, 2007 - Revision: 6.2
APPLIES TO
  • Microsoft Exchange Server 5.5 Standard Edition
  • Microsoft Exchange Server 2003 Standard Edition
  • Microsoft Exchange Server 2003 Enterprise Edition
Keywords: 
kbhotfixserver kbexchange550presp5fix kbbug kbfix kbqfe KB823799

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