Microsoft KB Archive/170471

= XCON: 290/4284 Errors Indicate Misconfigured MTA or Connector =

Article ID: 170471

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition
 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q170471





SUMMARY
The Microsoft Exchange Server Message Transfer Agent (MTA) may return messages back to originators with Non-Delivery Reports (NDRs) that state:   Unable to deliver due to MTA congestion. These NDRs will be accompanied by the following events logged in the Windows NT Server Event Viewer Application Log:   4284 A error occurred during connection/disconnection. Error code: 8511 [POP4 POP4 DOWN 4 179] (14)

290 A non-delivery report (reason code unable-to-transfer and diagnostic code  maximum-time-expired) is being generated for message C=US;A= ;P=Organization; L=Server03-970224213600Z-1460. It was originally destined for DN:/o=organization/ou=sitename/cn=recipients/cn=recipientnameC=US;A= ; P=organization;O=sitename;S=user;G=joe; (recipient number 1); and was to be  redirected to. [MTA DISP:RESULT 20 136] (12)



MORE INFORMATION
This combination of errors usually indicates a misconfigured MTA and/or connector. To troubleshoot this issue follow these steps:


 * 1) Verify that the Windows NT Servername matches the local MTA name.
 * 2) Verify that the naming conventions used to communicate between the two servers are functioning correctly.
 * 3) If X400 connectors are being used, make sure all the manually entered information is correct on both servers.

If any of these are incorrect, this behavior is by product design.

Keywords: kbinfo KB170471

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