Email in 2026: Strong ROI, rising AI adoption, and a measurement problem nobody’s fixing

Email is not going anywhere. But the distance between email programs that invest in measurement, deliverability, and optimization and those that run on assumptions is getting wider every year. Sinch Mailgun’s 2026 Email Impact Report draws from a global survey of more than 1,200 email senders and an analysis of over 400 billion real emails sent through Sinch Mailgun infrastructure in 2025. The report spans five chapters covering ROI, industry benchmarks, deliverability, AI adoption, and…