Microsoft KB Archive/842801

= Digitally signed messages remain in the Messages pending submission queue and are not delivered in Exchange 2003 =

Article ID: 842801

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 2003 Standard Edition
 * Microsoft Exchange Server 2003 Enterprise Edition

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Important This article contains information that shows you how to help lower security settings or how to turn off security features on a computer. You can make these changes to work around a specific problem. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this workaround in your particular environment. If you implement this workaround, take any appropriate additional steps to help protect your system.

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
Note This article discusses this problem only for the original release version of Microsoft Exchange Server 2003. To fix this problem in Exchange Server 2003 Service Pack 1 (SP1), you must obtain the hotfix that is provided in the following Microsoft Knowledge Base article:

843545 Digitally signed messages remain in the Messages pending submission queue and are not delivered in Exchange Server 2003 Service Pack 1

When you send a digitally signed e-mail message on a computer that is running Microsoft Exchange Server 2003, the e-mail message may not be delivered. When you view the Messages pending submission queue by using Exchange System Manager on the Exchange computer, the e-mail message may appear to be stuck in the queue.

Additionally, an event that is similar to the following event may be logged on your Exchange computer: Event Type: Error

Event Source: MSExchangeTransport

Event Category: Exchange Store Driver

Event ID: 348

Description:

A message could not be virus scanned - this operation will be retried later. Internet Message ID <6B909A01FBA732458FCEF70C0A141D2DD500@user-name.contoso.com>, Error Code 0x0.

Note This problem only occurs when the message is digitally signed. It does not occur if the message is digitally signed and encrypted.



CAUSE
This problem may occur when the following conditions are true:
 * You run an antivirus program on the Exchange computer that uses the Antivirus Application Program Interface (AVAPI), such as McAfee GroupShield 6.0 for Microsoft Exchange.
 * The AVAPI-based antivirus program is configured to use transport scanning.
 * You send a digitally signed message as a user who is hosted on the Exchange server that is running the antivirus program.



Hotfix information
A supported hotfix is now 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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
No prerequisites are required.

Restart requirement
You must restart the Microsoft Exchange Information Store service on the Exchange computer.

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.

Date        Time   Version         Size       File name -- 10-Jun-2004 20:54  6.5.6980.93       367,104  Exsmtp.dll 10-Jun-2004 01:37  6.5.6980.93        49,664  Mdbevent.dll 10-Jun-2004 02:05  6.5.6980.93     3,208,704  Mdbmsg.dll 10-Jun-2004 01:39  6.5.6980.93        24,064  Mdbrole.dll 10-Jun-2004 20:55  6.5.6980.93        13,312  Mdbtask.dll 10-Jun-2004 20:54  6.5.6980.93     5,046,784  Store.exe



WORKAROUND
Warning This workaround may make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk.

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 work around this problem, turn off AVAPI transport scanning on the Exchange computer. To do this, see your AVAPI software documentation for more information.

Important If you turn off transport antivirus scanning, we recommend that you turn on information store-level antivirus scanning on your Exchange server.

Alternatively, you can turn off transport scanning by setting the following Microsoft Windows registry entry to a value of 0:

Note A value of 1 indicates that transport scanning is turned on.

To do this, follow these steps:  Click Start, click Run, type regedit, and then click OK. Locate the following registry subkey:

 Right-click Enabled, click Modify, type 0, and then click OK. Quit Registry Editor.</ol>

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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

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

824684 Description of the standard terminology that is used to describe Microsoft software updates

817903 New naming schema for Exchange Server software update packages

Keywords: kbexchange2003presp2fix kbqfe kbfix kbbug kbhotfixserver KB842801

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