DMM TOC > 100 Retail Letters, Cards, Flats, and Parcels > 170 Media Mail|
1.1 Payment Method
The mailer is responsible for proper postage payment. Subject to the corresponding standards, postage for Media Mail and Library Mail may be paid by any method (see 604) except precanceled stamps.
In a postage-affixed single-piece mailing, the mailer must apply enough value in adhesive stamps or meter stamps equal to the postage required.