send as permissions when emailing Outlook 2013

Hi,

    I've configured the email in Acrobat Reader on a terminal server using imap/smtp. The same account is configured in Outlook 2013 using exchange on a local pc. Adobe creates the draft in Outlook, but when the user tries to send it, he gets an undeliverable message back that he does not have permission to send on behalf of this user. The user is himself so can not grant send as permissions as it is his own account. The draft shows the From option with his email address, but if we pick his name from the global address book in Outlook he is then able to send the email. I installed the same Adobe on his local pc and it works beautiful if Adobe configures it from Outlook (meaning the exchange setup, the instructions on how to setup email...). If I manually add in his email info using imap/smtp it does not work. It still acts as if he doesn't have permissions to his own account... Any ideas.....

Thanks!