When measuring newsletter success, it is important to consider a number of factors. The most important metric to track is the number of subscribers who unsubscribe from your newsletter. Next, it is important to evaluate the reach of your newsletters and how often they are opened. Additionally, you should measure how many people interacted with your newsletters, including subscribing, clicking through to a related article, or leaving a comment.
Finally, it is important to understand how your newsletters are being used by your subscribers. This can be measured through engagement surveys or by looking at the types of comments and questions submitted by subscribers. Overall, these metrics can help you to identify areas where you may need to make changes or improvements to your newsletter marketing strategy.