Regular cleansing is crucial for several reasons: - Improved Deliverability: By removing invalid emails, you reduce the chances of your emails bouncing, which can negatively impact your sender reputation. - Higher Engagement Rates: Keeping only engaged subscribers ensures that your emails are reaching an audience that is interested in your content. - Cost Efficiency: Many email service providers charge based on the number of subscribers. Keeping your list clean can help you avoid unnecessary costs. - Compliance: Regular cleansing helps you stay compliant with regulations such as GDPR and CAN-SPAM by ensuring that you only send emails to those who have opted in.