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I have set up an new mailbox in Exchange 2003 SP2 / AD and given 'Full Mailbox Access' under Mailbox rights in the Exchange Advanced Tab to another user. I also gave send of behalf permissions on under Delivery Options under the Exchange General Tab. I then added that mailbox to the user's profile via Mail under Control Panel and added the mailbox in outlook.

But when I go send an email from the new email address it doesn't work, I get a permission denied reply for the 'System Administrator' account.

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For some reason the account has to be in the GAL. So I forced an update of the GAL by going to Offline Address Lists in the Exchange System Manager, right clicking Default Address List, and Rebuild. I then re-downloaded the address book via Send/Recieve in Outlook, and the send of behalf worked right after that.

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