Ключевые слова: address, background, box, boxes, building, communicate, correspondence, delivery, envelope, home, house, incoming, inside, iron, key, letter, letterboxes, lock, mail, mailbox, mailboxes, many, message, metal, modern, new, newspaper, nobody, number, personal, post, postage, postal, postbox, postboxes, private, receive, recipient, residential, row, safe, security, send, service, slot,