Email Churn Rate is the percentage of email subscribers who disengage or unsubscribe over a given period. This metric includes both explicit churn (unsubscribes) and implicit churn (inactive recipients who stop engaging with emails). High churn rates can indicate issues with email content, frequency, or targeting. To reduce churn, businesses use engagement-based segmentation, personalization, and re-engagement campaigns. Email marketing platforms like Mailchimp and ActiveCampaign provide tools to track and analyze churn rates, helping marketers refine strategies to retain subscribers and improve email campaign effectiveness.