Open Rates: The percentage of recipients who open the email. Click-Through Rates (CTR): The percentage of recipients who click on links within the email. Conversion Rates: The percentage of recipients who complete a desired action, such as registering for an event or making a donation. Unsubscribe Rates: The percentage of recipients who opt-out of the mailing list. Engagement Metrics: Metrics such as social media shares, forward rates, and survey responses.