Microsoft KB Archive/264330

= XFOR: Internet Mail Service May Relay Messages Despite Restrictions =

Article ID: 264330

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q264330





SYMPTOMS
The Exchange Server 5.5 Internet Mail Service may relay messages if the messages are sent to a specific encapsulated addressing format.



CAUSE
This issue can occur if the message is sent to a server that is using one domain (for example, domain1) that is set to forward all messages to another domain (for example, domain2). The forward all messages option is set on the Connections tab. The server is also configured to reroute inbound SMTP mail (set on the Routing tab), has the routing restriction for Hosts and clients that successfully authenticate selected, and is configured to accept mail from &quot;localdomain.com&quot;. The message is in the following format:

&quot;IMCEA user@domain2.com&quot; @localdomain1.com

This format implies that this user does exist on domain2 and that domain1 has site addressing set to localdomain1.com.



RESOLUTION
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



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

Keywords: kbbug kbexchange550presp4fix kbexchange550sp4fix kbfix kbqfe KB264330

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