Article ID: 837993 - Last Review: July 24, 2007 - Revision: 1.10

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

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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 4xx 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.

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RESOLUTION

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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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:

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

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.

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

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