Send on behalf recipient's email address is missing

Guys, I have a users sending "on behalf of" another user. He can send it fine. However, when the message is delieverd the sender address is missing from the headers. So when a person reads the messages it doesnt show Joe Smith sent on behalf of Bob Dillion. It just says from bob Dillion. When this users sends other messages on behalf of others the message shows up fine with, Joe Smith on behalf of Bob Dillion.

Any ideas why this is happening?
KratosDefenseAsked:
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mikennedyCommented:
Most likely Joe Smith has been granted the "Send As" permission for Bob Dillion in ADUC. Assuming a Windows 2003 domain, go to ADUC, ensure that "Advanced Features" is checked on the View drop down menu (this will allow the display of the security tab when viewing the properities of a user account in ADUC). Go to the security tab on Bob Dillion's account and ensure that Joe Smith does not have "Send As" permission. This "Send As" permission is seperate from the Exchange/Outlook "Delegates".
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MesthaCommented:
Is that internal or external recipients?
If it is external recipients then that is to be expected. Send on Behalf of is an Exchange thing, which requires support by the client receiving the message.

Simon.
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KratosDefenseAuthor Commented:
I thought the same. But Joe Smith does not have send as permissions.  any other ideas?
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KratosDefenseAuthor Commented:
I had to restart the exchange services for the send on behalf to take effect.
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