1. Open Rates: This metric shows how many people opened your email and is crucial for understanding the effectiveness of your subject lines. 2. Click-Through Rates (CTR): Indicates how many recipients clicked on links within the email, helping you gauge the effectiveness of your content and CTAs. 3. Conversion Rates: Measures how many recipients took a desired action, such as making a purchase or signing up for a webinar. 4. Bounce Rates: Shows how many emails were not delivered successfully, which can indicate issues with your email list. 5. Unsubscribe Rates: Helps you understand if your emails are resonating with your audience or if they're causing people to opt-out.