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Exchange 2007 Send As Permission

This is the bounce back email received when a user tries to SEND AS another user. Attached is the Snap Shot of SendAs permissions. Am I doing something wrong? Anything else necessary?

From: Microsoft Exchange
Sent: Wednesday, April 15, 2009 10:52 AM
To: Kimberly Cambridge
Subject: Undeliverable: test

Delivery has failed to these recipients or distribution lists:

John Smith
You are not allowed to send this message because you are trying to send on behalf of another sender without permission to do so. Please verify that you are sending on behalf of the correct sender, or ask your system administrator to help you get the required permission.

Diagnostic information for administrators:

Generating server:

/O=COMPANY NAME/OU=First Administrative Group/cn=Recipients/cn=JohnS
#MSEXCH:MSExchangeIS:/DC=local/DC=bcr:MARTINI[578:0x000004DC:0x0000001D] #EX#

2 Solutions
It is difficult to know without knowing the context of anything - ie who you have granted Send As rights to, on which object and which user got the NDR.
However do remember that permission changes in Exchange are not live. If you make the change and then try to use it immediately it will usually fail. Exchange caches permissions for up to 2 hours.

Since this is AD-integrated...it could take a bit to 'work'. Here are some other posts/links to look at to verify your setup.

pzozulkaAuthor Commented:
The Mailbox that needs Send As rights is for user A. The user that needs to send emails as user A is (User B - KimberlyC). The user that got the NDR is User B.

Will give this 2 hours to see what happens. Thanks much.

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