And such emails may end up in the Company email list spam folder . Or may directly cause the cancellation of the newsletter subscription by of the users. Segment public: when a user chooses to subscribe to our newsletter. It offers relevant personal information that can be used to segment our public. Having the possibility of offering personalized newsletters for each public. If we do this correctly. We can increase the efficiency of our newsletters and. Therefore. The interest of our subscribers. Making different newsletters for each audience can be an arduous task. Therefore. A balance must be found between the number of newsletters and the profitability of carrying out this strategy Company email list.