Key performance indicators (KPIs) used to measure the success of email marketing campaigns include open rate, click-through rate, conversion rate, unsubscribe rate, and bounce rate. Additionally, marketers can measure email engagement metrics such as average time spent reading emails, number of emails opened, and number of clicks per email.
In order to ensure compliance with the CAN-SPAM Act, marketers must include a functional unsubscribe button in their emails, provide a physical mailing address, and include a clear subject line. Additionally, they must avoid using deceptive or misleading language, sending emails to people who have not opted in to receive them, and sending emails with false or misleading headers.