A letter box (or mail box) is a box or hole for receiving mail at a house or office. For collecting mail that is being sent, a post box is generally used instead.
Letter Box Media
A mail slot in London, located in the middle of the front door
This is a cast iron letter box designed, made and sold by Robin Lumley. *www.lumleydesigns.co.uk
An attached or wall-mount letterbox, with a hook underneath for newspapers