Yes. To access your webinar's registrant email list simply go to the webinar page. Click Promote & Manager, and then go to Manage Registrations or Email Attendees. On either of those pages, you can download the email list by clicking Download All Data in Excel.
Manage registrations section
Email attendees section
The default list will provide you with registrant names and emails. To gather more information add a custom registration field:
Both features are apart of every pro plan. You can learn more about our various plans here: https://www.bigmarker.com/pricing