To determine the effectiveness of an email campaign, track the following metrics: - Open Rates: The percentage of recipients who open the email. A higher rate indicates that the subject line and sender information are compelling. - Click-Through Rates (CTR): The percentage of recipients who click on links within the email. This shows engagement with the content. - Conversion Rates: The percentage of recipients who take a desired action, such as scheduling a check-up or downloading a resource. - Bounce Rates: The percentage of emails that were not delivered. High bounce rates can indicate issues with your email list. - Unsubscribe Rates: The percentage of recipients who opt out of the email list. This helps gauge the relevance and frequency of your emails.