The document discusses strategies for email campaigns aimed at winning back inactive customers. It provides examples from Screwfix, a home improvement retailer, of testing different approaches to defining inactivity, setting appropriate timescales for outreach, ensuring message relevance, and crafting effective messaging. Three case studies from Screwfix campaigns are presented that tested basic win-back emails with apologetic and friendly messaging, incentives like discounts, and reminders of limited-time offers. The studies found significantly higher open rates, conversion rates, and sales increases compared to blast emails without these win-back strategies.