Forward "Delivery Reports" mail to another mailbox

Hi,

I would like to redirect, for one mailbox, some "Delivery Reports" email to another mailbox (only the email that contains "delivered" word in the subject).

I create a rule (in Outlook, in OWA, in ECP...) but the rule works only for the old messages, for new messages the rule doesn't works. I think because the "Delivery Reports" are different object (report) not a real mail object.

Ideas?

Thanks