DMM TOC > 100 Retail Letters, Cards, Flats, and Parcels > 180 Library Mail|
Single-piece price Library Mail must be deposited at a time and place specified by the postmaster or designee at the office of mailing. Metered mail may be deposited at other than the licensing Post Office only as permitted under 705.19.0, Metered Mail Drop Shipment. Permit imprint mail must be presented at the Post Office under 604.5.0.
Library Mail weighing more than 13 ounces bearing only postage stamps as postage may not be deposited into a collection box, Postal Service lobby drop, Automated Postal Center (APC) drop, Postal Service dock, customer mailbox, or other unattended location. These mailpieces are also precluded from pickup service. 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.