Ключевые слова: address, blue, box, cloud, communication, concept, connection, contact, container, correspondence, design, document, email, envelope, flag, flat, full, icon, illustration, image, inbox, information, internet, isolated, letter, limit, mail, mailbox, mailbox full, mailing, mailman, maximum, message, newsletter, note, office, open, package, post, postage, postal, postcard, raster, receive, red, retrieve, send, shape, spam,