Ключевые слова: address, background, box, business, card, cartoon, communication, concept, connection, contact, container, correspondence, delivery, design, email, envelope, flag, flat, icon, illustration, information, inside, internet, isolated, letter, mail, mailbox, mailing, message, news, newsletter, open, package, paper, pigeon, post, postage, postal, postbox, postcard, receive, red, send, service, sign, spam, symbol,