Ключевые слова: approved, assess, check, checklist, checkmark, compliance, confirm, confirmation, contact, deliver, delivery, email, envelope, evaluate, exam, flat, icon, illustration, inbox, letter, list, mail, mailbox, mark, marketing, message, mobile app, newsletter, notification, open, post, questionnaire, result, review, right, risk control, send, sent, spam, subscribe, subscription, success, survey, symbol, tick, validate, verify, vote,