1. Identify Inactive Subscribers: Look for subscribers who havenât engaged with your emails in the last 6-12 months. 2. Send a Re-engagement Campaign: Before removing inactive subscribers, send them a re-engagement email to see if they are still interested. 3. Remove Hard Bounces: Hard bounces occur when an email cannot be delivered due to a permanent reason, such as an invalid email address. Remove these addresses immediately. 4. Eliminate Duplicate Emails: Duplicate email addresses can skew your analytics and inflate your subscriber count. 5. Validate Email Addresses: Use an email validation tool to verify the authenticity of email addresses. 6. Segment Your List: Segmenting your list based on engagement levels can help you target your most active subscribers more effectively.