SBS 2008 Send As Permission

On SBS 2008, I set the Full Permission and Send As permission on one user, giving another user full permission to send as the first user.

In Outlook, when the user tries to Send As the first user by using their username or email address in the FROM field, they get the following NDR:

Delivery has failed to these recipients or distribution lists:
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.

 I have NOT set the delegate permission as I heard that creates problems.
I have waited overnight for it to resolve.  I have also restarted the server.
Any ideas of what I'm missing?
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Jamie McKillopIT ManagerCommented:

Try picking the user directly off the GAL by clicking the From button.

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Satya PathakLead Technical ConsultantCommented:
Run the command to provide Send As and/or Receive As.

Add-ADPermission "userAlias" -User "DomainName\UserThatYouWantToGivePermissionTo" -Extendedrights "Send As"
> Add-ADPermission "userAlias" -User "DomainName\UserThatYouWantToGivePermissionTo" -Extendedrights "Receive
Satya PathakLead Technical ConsultantCommented:
b1dupreeAuthor Commented:
Here's what worked:

If you have a client in cached mode that is not updating the OAB, remove/rename *.oab files in their %userprofile%\Local Settings\Application Data\Microsoft\Outlook. Next time you start Outlook it will re-download the address book and create new OAB files. The problem was the oab files got corrupt and would not catch new updates. If it continues to happen, try excluding these oab files from your anti-virus scanner.

I found that here:


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Try picking the user directly off the GAL by clicking the From button.


Sorry to resurrect an old thread, but i have been having this frustrating problem for a long time and nothing helped until this suggestion...

So happy! Thanks JJ...
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