Outlook Out of Office (OOO) Assistant

I have a pilot Exchange 2003 environment connected to our production Domino environment using the Exchange Connector for Lotus Notes. When a user in Exchange turns on their OOO notification, it alerts other users in Exchange but when and e-mail comes from the Domino environment through the connector, no OOO is sent back. In addition, I’ve already checked the “Allow out of office responses”.

Does anyone know how to resolve?