You can use our built-in newsletter widget to signup guests without a third party integration. This may already be installed on your store home page or you can add it using the widgets by going to Appearance → Layouts in the admin.
⚠️ Pro Tip: third party newsletter/email list services are great. To see how to integrate those just click to search newsletter in our docs.
Export Your Subscriber List
To export a CSV of your list of subscribers simply open Reports → Customer → Guest Newsletter Signups in the admin.
⚠️ Pro Tip: for GDPR compliance add this into your Privacy Policy as another activity where you collect personal data. You should use the legal basis of Consent for collecting and processing the data. You should manage your unsubscribes separately (or using a third party service).