I have recently started actively working in the field of email marketing, and for me it was also a big step. At first, I also wondered about what metrics are really important for a successful campaign. In my opinion, there are several key metrics that are worth paying attention to. The first is the open rate of letters. The higher this rate, the more people saw your letter, which indicates an attractive topic and a good subscriber base. It is important to carefully approach the creation of headlines, they should be interesting and arouse curiosity. The next important metric is click-through rate (CTR), that is, the percentage of people who clicked on the links in the letter. This reflects how interesting and useful the content of the letter was for the recipient.