This document discusses using welcome email programs to drive engagement and ROI. It provides tips for elements of an effective welcome email series, including timing, content, and best practices. Sample welcome emails from brands like Net-a-Porter, MarketingProfs, Sears, and REI are analyzed. The document emphasizes testing subject lines, preview pane optimization, and expanding beyond a single welcome email. Overall it promotes using a multi-step welcome series to boost engagement and reduce churn.