What Google, Yahoo, Microsoft, and Apple are doing to your email

Google, Yahoo, Microsoft, and Apple have transformed from simple email delivery services into active intermediaries that classify, extract, rank, summarize, and even respond to emails on users' behalf. Using machine learning, they parse email templates, predict user actions, and surface content through AI-powered inbox features — often before a recipient opens a message. Traditional open-rate metrics are now unreliable, and senders using clean structured markup and genuinely useful content perform significantly better than those relying on image-heavy or misleading campaigns.