| Endorsement | Reason for non-delivery |
|---|---|
| * No Such Office in State | Addressed to nonexistent post office. |
| * No Such Street | Addressed to nonexistent street and correct street not known. |
| * No Such Number | Addressed to nonexistent number and correct number not known. |
| * Insufficient Address | Mail from another post office without number, street, box number, route number, or geographical section of city, or city and state omitted and correct address not known. |
| * Returned for Better Address | Mail of local origin incompletely addressed for distribution or delivery. |
| * Illegible | Address not readable. |
| Not Deliverable as Addressed - Unable to Forward | Mail undeliverable at address given; no change-of-address order on file; forwarding order expired; forwarding postage not guaranteed by sender or addressee; or, mail endorsed with sender's instructions DO NOT FORWARD. |
| * Outside Delivery Limits | Addressed to location outside delivery limits of post office of address. Hold mail for out-of-bounds customers in general delivery for specified period unless addressee filed order. |
| * No Mail Receptacle | Addressee failed to provide a receptacle for receipt of mail. |
| Returned for Postage | Mail without postage or indication postage fell off. |
| Moved, Left No Address | Addressee moved and filed no change-of-address order. |
| * Temporarily Away | Addressee temporarily away and period for holding mail expired. |
| Attempted - Not Known | Delivery attempted, addressee not known at place of address. |
| * Refused | Addressee refused to accept mail or pay postage charges on it. |
| * Vacant | House, apartment, office, or building not occupied (Use only if mail addressed "Occupant.") |
| * Box Closed - No Order | Post office box closed for nonpayment of rent. |
| * Returned to Sender Due to Addressee's Violation of Postal False Representation Law. | Mail returned to sender under false representation order. |
| * Unclaimed | Addressee abandoned or failed to call for mail. |
| Deceased | Use only when known that addressee deceased and mail not properly deliverable to another person. This endorsement must be made personally by the delivering employee and under no circumstances may it be rubber-stamped. Mail addressed in care of another is marked to show which person is deceased. |
| * Returned to Sender Due to Addressee's Violation of Postal False Representation and Lottery Law | Mail returned to sender under false representation order and lottery number. |
| * Returned to Sender Due to Addressee's Violation of Postal Lottery Law | Mail returned to sender under lottery order. |
| * In Dispute | Mail returned to sender by order of chief field counsel (or under D042) because of dispute about right to delivery of mail and cannot be determined which of disputing to mail. |
* When an alternative address format is used on Second Class mail, the publisher is notified of non-delivery only for those reasons marked with an asterisk (*). The exceptional-address format may not be used on: Express Mail; mail sent Registered, Certified, Insured, or COD; or mail sent with an address-correction service endorsement or any other type of endorsement.