Open Rates: Higher open rates indicate that the subject line and content are relevant to the segment. Click-Through Rates (CTR): A high CTR shows that the email content resonates with the audience. Conversion Rates: This KPI measures the effectiveness of your email in driving desired actions, such as purchases or sign-ups. Bounce Rates: A low bounce rate indicates that the email is reaching valid and engaged recipients. Unsubscribe Rates: High unsubscribe rates can be a sign that your segmentation needs refinement.