The permit number, city, and state of the issuing post office must be listed below the legend. Common Misconceptions
If you put a stamp on a BRM envelope, the recipient is typically not charged for the postage.
To be valid, the envelope or card must meet strict USPS Postal Explorer standards:
Vertical bars at the top edge that help automated sorters identify the mail type.
The imprint "NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES" must be in the upper right corner.
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
