Proper email segmentation improves the performance of your core email marketing metrics.
Open Rates: A good subject line is undeniably the best way to increase the open email rate. However, if the subject line relates to the audience, they are more likely to open the email.
Unsubscribe Rates: If the audience cannot relate to your content, they will unsubscribe immediately. So, with email segmentation, you can send the right message to the right people.