Ключевые слова: address, background, box, business, cloud, communication, concept, connection, container, correspondence, delivery, design, document, email, envelope, flag, icon, illustration, inbox, information, internet, isolated, letter, line, mail, mailbox, mailing, message, metal, news, newsletter, note, object, office, open, outline, package, paper, post, postage, postal, red, send, service, shape, sign, symbol, white,