The global cart abandonment rate is 70.22% in 2026. Abandoned cart emails achieve 50.5% open rates and $3.65 revenue per recipient on average — but top 10% performers generate $28.89 per recipient. This complete guide covers the optimal 3-email sequence with timing benchmarks, 7 real examples, subject line formulas, SMS strategy, platform setup guides for Klaviyo, Mailchimp and Omnisend, and checkout optimisation — all with Baymard Institute and Klaviyo data cited throughout.