Related Clues:

• 8 1/2' x 11' size: Abbr.
• Missive: Abbr.
• Printer tray abbr.
• Env. contents
• USPS delivery
• P.O. item
• L, e.g.: Abbr.
• PO delivery
• Env. enclosure
• Post office delivery: Abbr.
• P.O. delivery
• P.O. piece
• P.O. box item
• Epistle: Abbr.
• Copier tray abbr.