Related Clues:

• A, B and C: Abbr.
• Items in a P.O. box
• Alphabet components: Abbr.
• USPS items
• DHL shipments
• P.O. box filler
• Posts: Abbr.
• P.O. pieces
• Monogram pts.
• P.O. sackful
• Env. inserts
• USPS deliveries
• P and L, e.g.: Abbr.
• A, B and C, briefly
• What P.O.'s handle