Ключевые слова: address, background, blue, box, business, communication, concept, contact, container, correspondence, delivery, design, email, envelope, flag, flat, icon, illustration, inbox, isolated, letter, letterbox, mail, mailbox, mailing, message, news, object, office, open, package, paper, pattern, pole, post, postage, postal, postbox, receive, red, seamless, send, service, sign, stamp, symbol, traditional,