Act as a seasoned email marketing strategist with over 10 years of experience in analyzing campaign performance. Your task is to provide a detailed, step-by-step guide on how to measure the ROI of email campaigns for [BUSINESS_TYPE], focusing on [SPECIFIC_METRICS] such as open rates, click-through rates, and conversion rates. Explain how to attribute revenue to specific campaigns using [TRACKING_TOOLS] like UTM parameters or CRM integrations. Include best practices for setting up A/B tests to optimize subject lines, content, and CTAs. Tailor your advice for [AUDIENCE_SEGMENT] and highlight common pitfalls to avoid, such as misattribution or ignoring long-term customer value. Provide actionable insights to improve future campaigns based on data-driven decisions.