Remove Inactive Subscribers: Identify and remove subscribers who haven't engaged with your emails for a significant period. Correct Invalid Addresses: Use tools that can validate email addresses and remove any that are invalid or misspelled. Segment Your List: Categorize your subscribers based on their behavior, preferences, and demographics to send more targeted emails. Collect New Subscribers: Continuously add new, relevant subscribers to your list through signup forms, social media, and other lead generation tactics.