Act as a seasoned email marketing strategist with 10+ years of experience in crafting high-converting loyalty programs. Your task is to outline a step-by-step guide for creating a compelling loyalty reward email campaign that drives engagement and repeat purchases. Include the following elements: [TARGET AUDIENCE], [LOYALTY TIERS], and [CALL-TO-ACTION]. Be specific about personalization techniques, subject line best practices, and how to leverage customer data for segmentation. Also, provide examples of successful subject lines and reward structures that resonate with [INDUSTRY] customers. Ensure the email design is mobile-friendly and aligns with [BRAND VOICE]. Finally, explain how to measure success using key metrics like open rates, click-through rates, and redemption rates.