- Open Rate: This metric indicates the percentage of recipients who open your email. A higher open rate generally signifies a compelling subject line and relevant content. - Click-Through Rate (CTR): This measures the percentage of recipients who clicked on at least one link in your email. It helps gauge the effectiveness of your call-to-action. - Conversion Rate: This indicates the percentage of recipients who completed the desired action (e.g., making a purchase). It helps measure the ROI of your campaigns. - Bounce Rate: This shows the percentage of emails that were not delivered. A high bounce rate can harm your sender reputation and reduce deliverability.