When you're creating your Daily Specials and Daily Favorites newsletters in Brandibble, you can also add an option to have customers opt-in to receiving your brand newsletter. 

This will add a checkbox on the checkout page for new customers to have them sign up to receive your newsletter. Existing customers will also see this option directly on their account page. As customers opt-in, you can head to Reporting > Subscribers to see who's signed up to receive your brand newsletter and you can upload those addresses into your email marketing software.

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