Microsoft KB Archive/270910

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Knowledge Base

XCON: Non-Delivery Report States Recipient Not Recognized When a Large Message Is Sent

Article ID: 270910

Article Last Modified on 10/26/2006


  • Microsoft Exchange Server 5.5 Service Pack 3

This article was previously published under Q270910


After a user attempts to send an e-mail message over an X.400 Connector, the user may receive a non-delivery report (NDR) that contains the following text:

The recipient name is not recognized.

The X.400 Connector has a size-limit restriction that is set lower than the size of the sent message. In this case, the NDR should state that the message is too large, not that the recipient is not recognized.


This issue can occur if the message transfer agent (MTA) is build number 5.5.2651.92 or later.


To resolve this problem, obtain the latest service pack for Exchange Server 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

191014 XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack


Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5 Service Pack 3. This problem was first corrected in Exchange Server 5.5 Service Pack 4.

Additional query words: recipient-not-recognised size

Keywords: kbbug kbexchange550presp4fix kbexchange550sp4fix kbfix kbqfe KB270910