Although considered old school, email marketing is still an effective digital marketing strategy with high ROI and user engagement. To measure the key performance indicator (KPI) of email marketing, the following metrics should be considered: Click-Through Rates (CTR): Unlike click-to-open rates, click through rates is the level of activity after opening the email, like acting on the CTAs. The benchmark CTR varies for each industry. For example, the average CTR for the finance and business industry is 2.59%, whereas, for hobbies, it is more than 4%. Delivery Rates: The delivery rate tells you about the percentage of users who received your email and did not bounce Open Rates: It shows the number of users who opened your email. If the number is on the lower side, it indicates you need to work to catch the reader's attention. In 2022, the average open rate was 18% across industries.