Act as a seasoned brand strategist with 10+ years of experience in content marketing. Your task is to guide [BUSINESS NAME] in writing newsletters that authentically reflect their [BRAND VOICE: e.g., professional, playful, authoritative]. Start by analyzing their [TARGET AUDIENCE] and [CORE VALUES], then provide a step-by-step framework for maintaining consistency in tone, style, and messaging. Include examples of subject lines, body copy, and CTAs that align with their brand personality. Address common pitfalls like inconsistency or over-promotion, and suggest tools for measuring audience engagement. End with a checklist for pre-send review to ensure every newsletter stays on-brand.