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Exchange 2003 Mailbox Send As Not working

yo_bee asked
Last Modified: 2015-03-23
So I have a Mailbox that I needed a security group Send As permission as well as full access to the mailbox.
I am currently running Exchange 2003 with a Coex Exchange 2010 (In the process of migrating).

When I grant the Security group or the individual user Send As rights the get a message stating they do not have permission to send on behalf of,  

Not sure why this is the case.  I am able to send as user using my account (Domain Admin).

If I do grant Delegate Rights to send on behalf of the users are able to send messages from the mailbox (within the profile) as if it is coming from the mailbox.  If I mount the mailbox to the current user Outlook Profile the message states that the message is sent on behalf of.
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