How can I prevent messages arriving with “on behalf of [User]” appended to the intended sender name?
In order to avoid the suffix you have to grant the respective user the “Send As” permission on the relevant object. This is different from assigning “Send on behalf” rights which is what happens when you declare a user to be the delegate of an account via the Outlook UI (you can also do this via the Delivery Options button on the Exchange General tab of the corresponding AD object’s Properties window).
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