Microsoft KB Archive/254992

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XCON: MIME Internet X.400 Enhanced Relay Encapsulates X.400 Addresses in the Wrong SMTP Address

Article ID: 254992

Article Last Modified on 10/26/2006


  • Microsoft Exchange Server 5.5 Service Pack 3

This article was previously published under Q254992


An Exchange Server computer that is configured to perform MIME Internet X.400 Enhanced Relay (MIXER) address mapping may encapsulate an unknown X.400 address in an SMTP address that is derived from the X.400 address, instead of from the SMTP address of the server. If this unknown X.400 address is the address from which the message was sent, then replies from the Internet are not possible.

For example, if an X.400 user with an O/R address of "c=gb; a=admd; p=prmd; s=sender" sends a message to the Internet by using an Exchange Server MIXER server that has an SMTP proxy address of "," the SMTP message is generated with the following From line:


The address should be the following:


Note that this behavior only occurs if the X.400 sender is not in the global address list on the MIXER server. If there is a global address list entry for the user, then the SMTP address from the global address list entry is correctly used.


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


To work around this problem, add a custom recipient for the X.400 user, with an SMTP Address valid for this Internet Mail Service.


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: gal

Keywords: kbbug kbexchange550presp4fix kbexchange550sp4fix kbfix kbqfe KB254992