1. Know Your Audience: Understand the demographics, preferences, and pain points of your audience. 2. Maintain a Professional Tone: Even if your brand voice is casual, ensure it’s never too personal or intrusive. 3. Personalize Thoughtfully: Personalization should add value. Use data to make your emails relevant but avoid sounding like you know too much about the recipient. 4. Segment Your List: Tailor your messages to different segments to ensure relevance without crossing personal boundaries.