Measuring the success of your promotional emails is essential for improving future campaigns. Key metrics to track include: - Open Rate: The percentage of recipients who opened the email. - Click-Through Rate (CTR): The percentage of recipients who clicked on a link within the email. - Conversion Rate: The percentage of recipients who completed a desired action, such as making a purchase. - Bounce Rate: The percentage of emails that were not successfully delivered. - Unsubscribe Rate: The percentage of recipients who unsubscribed after receiving the email.