Originally Posted by jibi
What doesn't make sense, in my opinion, is why we would set implicit 'Send As' permissions in Exchange at the Store level and it wouldn't be applicable to the individual accounts that reside within that Store. Leave it to Microsoft to put the same damn permissions in 10 different places.
Granting "Send As" at the store level grants permission to send as the database itself. Not sure why anyone would want to do that, but that's what that permission is for.