Open Rate: The percentage of recipients who open the email. This helps gauge the effectiveness of subject lines. Click-Through Rate (CTR): The percentage of email recipients who click on one or more links in the email. This indicates the engagement level of the content. Conversion Rate: The percentage of recipients who completed a desired action (e.g., making a purchase) after clicking on a link in the email. Bounce Rate: The percentage of emails that could not be delivered to the recipient's inbox. High bounce rates can negatively impact sender reputation. Unsubscribe Rate: The percentage of recipients who opt out of receiving future emails. A high unsubscribe rate can indicate issues with email relevance or frequency.