Ключевые слова: address, air, airmail, background, blank, blue, business, card, communication, concept, copy, correspondence, delivering, design, document, email, empty, envelope, icon, image, information, isolated, letter, mail, message, object, office, open, package, page, paper, pattern, post, postage, postal, postcard, receive, retro, send, service, sign, single, space, stationery, symbol, vintage, white, writing,