Regular Data Cleaning: Periodically remove duplicate, incorrect, or outdated data to keep your database clean. Validation Tools: Use validation tools to verify email addresses before adding them to your list. Segmentation: Segment your email list to ensure that the right messages are sent to the right people. Feedback Loops: Implement feedback loops to get real-time updates on email deliverability and engagement. Double Opt-In: Use double opt-in methods to ensure that the email addresses you collect are accurate and belong to active users.