Ключевые слова: alert, background, business, chat, communication, concept, conceptual, contact, copy space, customer, digital, email, email marketing, envelope, equipment, finger, fingers, gesture, half, hand, icon, internet, mail, man, message, messenger, mobile, modern, network, new, new email, new message, notification, office worker, online, open, optimize, person, phone, receive, screen, social, social media, spam, strategy, technology, touch, using, web,