Ключевые слова: address, background, box, brick, building, business, communication, day, delivery, design, entrance, envelope, fence, home, house, income, iron, key, letter, letterbox, lock, mail, mailbox, message, metal, modern, mounted, newspaper, nobody, outdoors, outside, personal, post, postage, postal, postbox, private, receive, recipient, residential, safety, security, send, service, street, wall,