Microsoft KB Archive/303889

= MX record failover does not occur when the remote SMTP Host responds with a 4xx error =

Article ID: 303889

Article Last Modified on 2/28/2007

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Service Pack 4
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Exchange 2000 Server Standard Edition

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This article was previously published under Q303889



SYMPTOMS
When an external DNS resolver is used on your Simple Mail Transfer Protocol (SMTP) virtual server, the next MX record is not tried when the host for the first MX record returns a &quot;4xx&quot; error.



Windows 2000 Service Pack 1 and Service Pack 2
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

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

  Date      Time   Version        Size     File name 09/13/01 10:52  5.0.2195.4051  320,784  Aqueue.dll 09/13/01 10:52  5.0.2195.4051   66,832  Mailmsg.dll 09/13/01 10:52  5.0.2195.4051   38,160  Ntfsdrv.dll 09/13/01 10:52  5.0.2195.4236  435,472  Smtpsvc.dll

Note Before you apply the hotfix that is described in this article, install Windows 2000 Service Pack 2 (SP2) and Exchange 2000 Service Pack 1 (SP1).

Windows 2000 Service Pack 4
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 --  08-Nov-2003  01:23  5.0.2195.6872     322,320  Aqueue.dll 08-Nov-2003 01:23  5.0.2195.6824      67,856  Mailmsg.dll 08-Nov-2003 01:23  5.0.2195.6872      38,672  Ntfsdrv.dll 08-Nov-2003 01:23  5.0.2195.6872     444,688  Smtpsvc.dll



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

Additional query words: kbMgmtAdmin esm

Keywords: kberrmsg kbbug kbfix kbwin2000presp3fix kbqfe kbsysadmin kbwin2000sp3fix kbenv kbnetwork kbhotfixserver KB303889

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