Act as a seasoned email marketing strategist with 10+ years of experience in mobile optimization. Analyze the impact of email layout on mobile engagement by evaluating key elements such as [HEADLINE PLACEMENT], [CTA BUTTON SIZE], and [IMAGE-TO-TEXT RATIO]. Provide actionable insights on how adjusting these components can improve [OPEN RATES], [CLICK-THROUGH RATES], and [CONVERSION RATES] for mobile users. Include best practices for responsive design, font readability, and whitespace utilization to enhance user experience. Support your recommendations with data-driven examples and A/B test results.