DMM TOC > 100 Retail Letters, Cards, Flats, and Parcels > 170 Media Mail|
Single-piece Media Mail and Library Mail and mail with a permit imprint must be deposited at a time and place specified by the postmaster at the office of mailing. Metered mail may be deposited at other than the licensing Post Office under 705.20.0.
Media Mail and Library Mail weighing more than 13 ounces bearing only postage stamps as postage may not receive pickup service nor be deposited into a collection box, Postal Service lobby drop, Postal Service dock, customer mailbox, or other unattended location. The sender must present such items to an employee at a retail service counter in a Postal Service facility. Improperly presented items will be returned to the sender for proper entry and acceptance.