You can offer to subscribe to your newsletter « in 1 click » on your login page.
To do this, go to the Connection portal page and check the Show registration button option.

To learn more, read the following article: Configure the login portal
Registration Overview
This feature is displayed when displaying visuals after logging in to the user. A button appears just below the visual.

As at this step, the user is already logged in and their email address is known, one click is enough to register.
List and export manually
You can consult the list of visitors who have subscribed to the newsletter in the Customer Management / Newsletter Subscriptions section. If integration with your newsletter service is not activated, you can manually export the list of subscribers for example each month to grow your newsletter list.

Click the Export to Excel button to generate a CSV that you can import into your newsletter management platform.
