- Remove Invalid Email Addresses: Use tools to identify and remove email addresses that are no longer valid. - Eliminate Duplicates: Ensure that each email address appears only once in your list. - Correct Typos: Small typos can result in undeliverable emails. Correct common errors to improve deliverability. - Segment Your List: Divide your list into segments based on engagement levels, demographics, or purchase history. - Update Preferences: Regularly ask your subscribers to update their email preferences to ensure they are receiving relevant content.