To measure the effectiveness of your email marketing campaigns, you should track the following metrics: - Open Rate: The percentage of recipients who opened your email. - Click-Through Rate (CTR): The percentage of recipients who clicked on a link within your email. - Conversion Rate: The percentage of recipients who completed a desired action, such as making a purchase. - Bounce Rate: The percentage of emails that could not be delivered to the recipient's inbox. - Unsubscribe Rate: The percentage of recipients who opted out of your email list after receiving an email.