Related Clues:

• It's delivered to your house
• It's delivered during the week
• Stamped letters
• Delivered letters
• Paper size option: Abbr
• Printer-paper size: Abbr
• It may be fed through a slot
• P.O. box fillers
• Predecessors of much email: Abbr
• It may be more than four letters
• Word with fan or snail
• A lot of it is junk
• Postal stack
• Buildup during vacation
• He delivered letters