1. Collect Emails Ethically: Use [double opt-in]() methods to ensure that subscribers genuinely want to receive your emails. 2. Regularly Clean Your List: Remove inactive subscribers and hard bounces to keep your list fresh and engaged. 3. Segment Your Audience: Categorize your subscribers based on their behavior, preferences, and demographics to send more targeted and relevant emails. 4. Use Data Validation Tools: Implement tools that can verify and validate email addresses at the point of collection.