Ключевые слова: abstract, address, advertise, box, business, cartoon, color, communication, concept, container, correspondence, delivery, design, email, envelope, flat, grass, icon, illustration, image, industry, information, isolated, letter, letterbox, mail, mailbox, mailing, message, metal, news, newspaper, object, office, open door, package, paper, post, postal, postbox, promotion, receive, red flag, send, service, shipment, sign, symbol, white background,