Ключевые слова: abstract, alert, background, banner, beautiful, blue, bulk, business, campaign, channel, communication, concept, conceptual, contact, customer, cut, cut out, cutout, design, digital, electronic, email, email marketing, engagement, envelope, icon, inbox, internet, junk, leads, letter, mail, marketing, message, minimalist, new email, notification, online, open, optimize, paper, problem, receive, send, sign, spam, symbol, unsubscribe, web,