Related Clues:

• Stamp issuing org.
• Click-N-Ship org.
• Delivery org.
• Co. nicknamed 'Big Brown'
• Co. informally known as Brown
• Downs' partner
• Downs opposite
• Downs opposite
• Peak periods
• UPS competitor
• Mail-truck abbr.
• Increases, as the ante
• Agcy. with an eagle logo
• First-class org.?
• Brown, in ads