1. Remove Invalid Emails Use email verification tools to identify and remove invalid email addresses. These tools can detect typos, fake emails, and addresses that no longer exist.
2. Segment Inactive Subscribers Identify subscribers who haven't engaged with your emails for a significant period (e.g., 3-6 months). Segment them into a separate list and attempt a re-engagement campaign. If they still don't respond, consider removing them from your main list.
3. Implement Double Opt-In Double opt-in ensures that new subscribers confirm their email address before they are added to your list. This helps in reducing fake or incorrect email entries.
4. Monitor Engagement Metrics Regularly review your engagement metrics like open rates, click-through rates, and conversion rates. Use these insights to identify and remove unengaged subscribers.
5. Use Re-Engagement Campaigns Send targeted re-engagement emails to inactive subscribers. Offer incentives or ask for feedback to rekindle their interest. If there is no response, it might be best to remove them.