Removing Duplicates: Ensure that each email address appears only once in your list. Validating Email Addresses: Use tools to verify the accuracy of email addresses in your list. Eliminating Inactive Subscribers: Remove or re-engage subscribers who haven't interacted with your emails in a specified period. Correcting Typos: Fix common typos in email addresses that can prevent deliverability. Updating Contact Information: Regularly update your subscriber information to maintain accuracy.