Learners page in your admin dashboard includes full name and email address details of all your learners. Each learner group represents a collection with a specific learners' access method. Find out detailed information here.
You can also find the emails you collect in your mini-course report. To learn more about mini-course analytics, you can take a look at here.
Additionally, you can see the email address data of your learners in the collection report. To learn more about collection analytics, you can take a look at here.
Besides, webhooks are available for connecting with mailing platforms and automating your newsletter subscriptions via the sign-up wall! You can find sample tutorials here.