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Mail may not be delivered to certain domains if Server OS is Windows Server 2003
Article ID: 820284 - View products that this article applies to.
Important This article contains information about editing the metabase. Before you edit the metabase, verify that you have a backup copy that you can restore if a problem occurs. For information about how to do this, see the "Configuration Backup/Restore" Help topic in Microsoft Management Console (MMC).
When a user in your organization tries to send messages to certain domains by using Simple Mail Transfer Protocol (SMTP), those messages are not delivered successfully. This issue can occur with either IIS or Exchange when the underlying Operating System on the server is Windows Server 2003.
Additionally, an event that is similar to the following appears in the event log:
Event ID: 4000
This issue occurs if all the following conditions are true:
Warning If you edit the metabase incorrectly, you can cause serious problems that may require you to reinstall any product that uses the metabase. Microsoft cannot guarantee that problems that result if you incorrectly edit the metabase can be solved. Edit the metabase at your own risk.
Note Always back up the metabase before you edit it.
To resolve this issue, configure the Simple Mail Transfer Protocol (SMTP) service on the Windows Server 2003 computer to only use UDP. When you configure the Simple Mail Transfer Protocol (SMTP) service to use UDP only, the SMTP computer uses the results from a truncated response that the SMTP computer receives from a DNS computer to complete the message delivery to the destination domain. To configure the Simple Mail Transfer Protocol (SMTP) service to use UDP only, add or modify the following metabase key:
Key ID: 36997Note The following table describes the possible values that you can assign to key ID 36997:
Key type: DWORD
Key value: 2
To modify the metabase, follow these steps:
Collapse this tableExpand this table
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/832223/ )Some DNS name queries are unsuccessful after you upgrade your DNS server to Windows Server 2003
Article ID: 820284 - Last Review: October 25, 2007 - Revision: 3.5