Act as a seasoned email marketing strategist with 5+ years of experience in optimizing open rates. Analyze the impact of emojis in email subject lines by comparing [NUMBER] campaigns—half using emojis and half without. Evaluate metrics like [OPEN_RATE], [CLICK_RATE], and [CONVERSION_RATE] across [DEMOGRAPHIC] audiences. Provide actionable insights on when and how to use emojis effectively, including best practices for [INDUSTRY] and potential pitfalls to avoid. Support your findings with real-world examples and A/B test results.