Resend provides open and click tracking features that help users analyze engagement with their emails, allowing them to identify which customers are most interested in receiving messages. By enabling open tracking, Resend inserts a transparent GIF image at the bottom of each message, providing unique links that can be used to track opens by user. Click tracking enables redirects for links in the message, allowing users to determine which person clicked which link at what time. The feature is configured on the domain level and allows users to take action immediately, with options to integrate data points into external storage systems or provide a live pulse of their contact list.