Postage Necessary: No

To be valid, the envelope or card must meet strict USPS Postal Explorer standards:

A series of uniform bars must be printed directly below the imprint.

The permit number, city, and state of the issuing post office must be listed below the legend. Common Misconceptions No Postage Necessary

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

Vertical bars at the top edge that help automated sorters identify the mail type. To be valid, the envelope or card must

The phrase primarily refers to the United States Postal Service (USPS) Business Reply Mail (BRM) system, where a business pays the postage for a recipient's response. It also refers to a 2018 independent film. ✉️ Business Reply Mail (BRM)

The imprint "NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES" must be in the upper right corner. 🎬 " No Postage Necessary " (2018 Film)

If you put a stamp on a BRM envelope, the recipient is typically not charged for the postage.