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Q303889: MX Record Failover Does Not Occur When 4xx Error Occurs

Article: Q303889
Product(s): Windows for Workgroups and Windows NT Networking Issues
Version(s): 2000,2000 SP1,2000 SP2
Operating System(s): 
Keyword(s): kbenv kberrmsg kbnetwork kbtool kbSysAdmin kbWin2000PreSP3Fix kbWin2000sp3fix
Last Modified: 15-AUG-2002

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The information in this article applies to:

- Microsoft Windows versions 2000, 2000 SP1, 2000 SP2 Server 
- Microsoft Windows versions 2000, 2000 SP1, 2000 SP2 Advanced Server 
- Microsoft Exchange 2000 Server 
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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 "4xx" error.

RESOLUTION
==========

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:

  Q260910 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).


STATUS
======

Microsoft has confirmed that this is a problem in the Microsoft products that
are listed at the beginning of this article. This problem was first corrected in
Windows 2000 Service Pack 3.


Additional query words: kbMgmtAdmin esm

======================================================================
Keywords          : kbenv kberrmsg kbnetwork kbtool kbSysAdmin kbWin2000PreSP3Fix kbWin2000sp3fix 
Technology        : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbExchangeSearch kbExchange2000Search kbWinAdvServSearch kbWin2000AdvServSP2 kbWin2000AdvServSP1 kbwin2000ServSP1 kbwin2000ServSP2 kbExchange2000Serv
Version           : :2000,2000 SP1,2000 SP2
Hardware          : x86
Issue type        : kbbug
Solution Type     : kbfix

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