There are several methods to track user behavior in email marketing: - Open Rate: Measures how many recipients open your email. This is tracked using an invisible tracking pixel embedded in the email. - Click-Through Rate (CTR): Tracks the number of clicks on links within your email. Unique tracking URLs help you identify which links are most engaging. - Conversion Rate: Measures the percentage of recipients who complete a desired action, such as making a purchase or filling out a form. - Bounce Rate: Indicates the percentage of emails that were not delivered to the recipient's inbox. This can help you clean your email list and improve deliverability. - Unsubscribe Rate: Tracks how many recipients opt out of your email list, providing insights into the relevance of your content.