The IBM Proof of Entitlement certificate (PoE) is a document that IBM sends to customers who purchase software products. The PoE confirms to you the eligible products and level of use for which you are authorized. It includes important order information such as your IBM customer number, IBM site number, and IBM order number. IBM emails the PoE by default to the Primary Site Contact on the order from the email account "Passport_Advantage@ibm.com" and with the subject of either "IBM Passport Advantage® Proof of Entitlement" or "IBM Passport Advantage Express Proof of Entitlement".