Ключевые слова: a letter, address, at, background, bold, business, communication, concept, contact, contour, correspondence, design, email, envelope, flat, icon, illustration, information, interface, internet, isolated, letter, letter a, logo, mail, mailing, message, modern, newsletter, object, outline, paper, post, postage, postal, receive, round, rounded, send, sign, single, snail, spam, stroke, symbol, web, website, white,