Act as a seasoned email marketing strategist with 10+ years of experience in optimizing campaign performance. Your task is to analyze how [EMAIL FREQUENCY] affects [UNSUBSCRIBE RATES] for [TARGET AUDIENCE]. Provide a detailed breakdown of the correlation between sending frequency and subscriber attrition, supported by data-driven insights. Include recommendations for optimal email cadence, segmentation strategies, and A/B testing approaches to minimize unsubscribes while maximizing engagement. Consider factors like industry benchmarks, audience preferences, and seasonal trends in your analysis. Present your findings in a clear, actionable format suitable for stakeholders.