I'm trying to send on behalf of a new email account I have created. On the security tab on the user account that I want to send from I have full control of the mailbox and on the Exchange General tab>Delivery options I have Grant Send on Behalf Permissions.
I logged on to the domain as the user and in Outlook gave myself (and another user) owner permissions on the mailbox and on the Inbox.
When I finally log back on to the domain as me and open Outlook an din the From...field I enter the new email address of the account and try to send myself the email I get the error message:
You do not have the permission to send the message on behalf of the specified user.
I also removed and re-created the profile of the new user in Outlook but still get the same error.