r777The USPS CASS Cycle O regulation states that any physical address assned a phantom carrier route of R777 is not elible for street delivery.The R777 Phantom Route from USPS® is a postal carrier route used to categorizepeople who have a correct physical address but are inelible to receive mail for another reason.Learn more about Phantom Route R777 and how it can help drastically reduce undeliverablemail.