Segmentation allows you to send different emails depending on the interests, gender, age, purchase history, and location of your customers. Such emails have higher open rates, and their recipients show more interest in the company’s newsletters.
The main rule in the process of collecting subscribers’ contacts is their permission. That’s why buying other people’s lists and databases is a bad idea, because these users not only didn’t give their permission to receive your emails, but also don’t know you and aren’t interested in your brand’s products.