In order to use email addresses collected through BigCommerce's native newsletter feature for an email sending service like MailChimp, you'll have to export your subscriber list. This article will show you how to export your BigCommerce newsletter subscriber list, so you can use it for services like MailChimp.
Exporting your Subscriber List
In order to export your mailing list, first go to the backend of your BigCommerce site. This is likely accessible by going to [your store name here].com/admin. From there, head to the Marketing section on the left side menu:
From the Marketing Menu, select Email Marketing:
On the Email Marketing page, select the Export Only tab:
Finally, from the resulting page you can download a CSV file of your subscriber list.
Click on Download to CSV file in order to download a CSV file of your subscriber list. By default, this file will likely go to the "downloads" folder on your computer.
If you have additional questions, please feel free to reach out with a support request.