Regular Data Cleaning: Periodically remove outdated, duplicate, or incorrect data from your email lists. Verification Tools: Use email verification tools to check the validity of email addresses before adding them to your list. Double Opt-In: Implement a double opt-in process to ensure that subscribers genuinely want to receive your emails. Data Enrichment: Enhance your existing data with additional information from reliable sources to get a complete view of your subscribers. Segment Appropriately: Segment your email lists based on accurate and relevant data to deliver more targeted messages.