metal or plastic box red, blue, green, or yellow in color a slot or opening to insert mail Royal Mail or post office logo on the front a sign or label with the post office address a flag to indicate when mail has been collected
postbox which has metal or plastic box postbox which has red, blue, green, or yellow in color postbox which is a slot or opening to insert mail postbox which has Royal Mail or post office logo on the front postbox which is a sign or label with the post office address postbox which is a flag to indicate when mail has been collected