Related Clues:

• Drop in a letterbox
• Letters, collectively
• It's inside an env.
• Drop in a slot
• It's not delivered on Sundays
• Postal sackful
• Attire for Galahad
• It contains a lot of letters?
• Post or body armour
• American post
• Post in America
• Post from Lima
• American post from Lima
• Do a thousand get sick of being enveloped?
• Does he come back with the letters like this?