DMM TOC > 100 Retail Letters, Cards, Flats, and Parcels > 170 Media Mail|
175 Mail Preparation
All Media Mail and all Library Mail must bear a delivery address that includes the correct ZIP Code or ZIP+4 code. Each piece must bear the sender's return address.
1.3 Basic Markings
The applicable basic required marking—“Media Mail” or “Library Mail”—must be printed on each piece in the postage area, or it may be printed on the shipping address label according to the standards in 102.3.4.