153 Placement of Postage

1. Postage stamps and postage–paid impressions must be applied to the address side of mail in the upper–right corner. The postage meter stamp, postage validation imprinter (PVI) label, or permit may be affixed directly on the mailpiece or on the wrapper when plastic wrap is used.
2. Nonpostage stamps, labels resembling postage stamps, or impressions resembling postage–paid impressions must not be placed on the address side of international mailpieces.