In Magento 2, you can configure subscription confirmation by activating the double opt-in mode in the marketing settings. This ensures that users will receive an email with a link to confirm their subscription. To divide subscribers into groups, the standard Magento 2 functions may not be enough, so it is better to use modules, for example, from Amasty, which allow you to segment the audience and set up personalized mailings. There are also extensions for integration with Mailchimp or SendGrid. A convenient solution would be
magento 2 newsletter popup , which will help you attract more subscribers through pop-ups.
