Microsoft KB Archive/837993

= The SMTP service does not fail over to the next MX record after the remote SMTP host for an MX record responds with a 4xx error =

Article ID: 837993

Article Last Modified on 7/24/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise x64 Edition

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SYMPTOMS
The Simple Mail Transfer Protocol (SMTP) service does not fail over to the next mail exchanger (MX) record after the host for the first MX record returns a 4 error. This problem occurs when a Microsoft Windows Server 2003-based computer has an external DNS resolver that is configured for a SMTP virtual server.



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 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.

Windows Server 2003, 32-bit editions
Date        Time   Version            Size    File name     Platform - 05-Mar-2004 00:03  6.0.3790.137      456,704  Smtpsvc.dll   x86

Windows Server 2003, 64-Bit Enterprise Edition
Date        Time   Version            Size    File name     Platform - 04-Mar-2004 16:38  6.0.3790.137    1,174,528  Smtpsvc.dll   IA-64



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



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

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

Keywords: kbhotfixserver kbqfe kbhotfixserver kbqfe kbtransport kbwinservnetwork kbnetwork kbbug kbfix kbqfe kbwinserv2003presp1fix KB837993

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