1. Open Rate: Indicates how many recipients opened your email. 2. Click-Through Rate (CTR): Measures the percentage of recipients who clicked on a link within your email. 3. Conversion Rate: Tracks the number of recipients who completed a desired action, such as filling out a form or making a purchase. 4. Bounce Rate: Shows the percentage of emails that couldn't be delivered. 5. Unsubscribe Rate: Indicates how many recipients opted out of your email list.