Taping a BRM envelope to a heavy box (like a "box of rocks") is often considered a mail prank or "trolling." While some claim it forces companies to pay high shipping fees, the USPS may treat it as nonmailable or return it to the sender. 🎬 " No Postage Necessary " (2018 Film) I Love No Postage Necessary Sales Pieces | by Ed Swartz
This is a pre-authorized service that allows a person to mail a letter or postcard back to a company without applying a stamp. The company (permit holder) is billed only for the pieces actually returned. Key Format Requirements No Postage Necessary
A series of uniform bars must be printed directly below the imprint. Taping a BRM envelope to a heavy box
To be valid, the envelope or card must meet strict USPS Postal Explorer standards: Key Format Requirements A series of uniform bars
The imprint "NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES" must be in the upper right corner.
Vertical bars at the top edge that help automated sorters identify the mail type.
If you put a stamp on a BRM envelope, the recipient is typically not charged for the postage.