Tracking the right metrics is crucial to understanding the success of your email campaigns. Key metrics include open rates, click-through rates, conversion rates, bounce rates, and unsubscribe rates. Open rates tell you how many people are interested in your emails, while click-through rates reveal how engaging your content is. Conversion rates show the effectiveness of your CTAs, and bounce rates indicate the quality of your email list. Unsubscribe rates can help you gauge if your email frequency or content needs adjustment.