In Magento 2, you can manage effectively the subscription list. You can view all subscribers, take action as changing status to unsubscribe and even deleting the marked subscriber if necessary. Whenever customers request to unsubscribe your email, you should take action in a short period of time to satisfy them, if not that may make your customers unhappy and build negative perspectives on your site.
Magento 2 supports you to easily export your subscription list via CSV or XML files if you want to use your subscription list for many tasks or use a third-party service to send newsletters.
Marketing. In the
Statuscolumn, find the
subscriberin the list. After that, mark the checkbox in the first column.
Unsubscribe. Then, click
Submit. The status of the marked record will changes to
Statuscolumn, use the filter controls to filter all statuses of Subscribed that fit the appropriate website, store, or store view.
Exportand save the file
Ref: Magento 2 User Guide
It comes to the end of tutorial: How to Add, Manage, Export Subscribers in Magento 2.