Exchange 2010 and Outlook 2010 sending message to self

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http://serverfault.com – I have a customer who is copying herself on e-mails that she sends periodically. If she selects her mail address from the GAL it works fine, but if she types her smtp e-mail address in the cc line, it comes back as undeliverable, not a valid e-mail address. It is not in the cache and adding from the GAL does not add it back into the cache. It used to work fine. Thoughts? (HowTos)