Microsoft KB Archive/221434

= XADM: "Send As" Functionality Does Not Work When DPA Is Used as Authentication Method =

Article ID: 221434

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition
 * Microsoft Exchange Server 5.5 Service Pack 1
 * Microsoft Exchange Server 5.5 Service Pack 2

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This article was previously published under Q221434





SYMPTOMS
When you use Distributed Password Authentication (DPA) as the authentication method, "SendAs" functionality does not work correctly.

Steps to Reproduce the Problem

 * 1) Assign "SendAs" Permission for User1 to User2.
 * 2) Log on as User2 and make sure you are able to send as User1.
 * 3) Log on as User3 and send message using User1 in the From field. This message will also get delivered.

This problem does not occur when Windows NT LAN Manager (NTLM) is used as the authentication method.



CAUSE
This behavior is caused by a logic error in the code. The main difference between Windows NT and Membership security is that with Membership, one Windows NT account, the "broker," is mapped to all the Exchange Server mailboxes.



RESOLUTION
To resolve this problem, obtain the latest service pack for Exchange Server version 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

The English version of this fix should have the following file attributes or later:

Component: Information Store



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Exchange Server 5.5 Service Pack 3.

Additional query words: SendAs DPA NTLM Authentication

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe KB221434

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