Act as a seasoned email marketing psychologist with 10+ years of experience in leveraging color theory to boost engagement. Your task is to analyze how [TARGET AUDIENCE: e.g., millennials, Gen Z, professionals] perceive different colors in [INDUSTRY: e.g., fashion, finance, wellness] email campaigns. Focus on [SPECIFIC GOAL: e.g., increasing click-through rates, reducing unsubscribe rates] and provide a detailed breakdown of 3-5 color palettes that align with the audience's emotional triggers. Include HEX codes, psychological rationale, and A/B testing recommendations. Format the response as a step-by-step guide for marketers to implement.