The MailChimp extension for the Sell Media plugin for WordPress allows your buyers to sign up for your preferred MailChimp newsletter list. Buyers will see a “Sign Up for Newsletter” checkbox on the checkout page. This option will only appear for users who are not logged in.
MailChimp is one of the most popular and feature rich web apps for creating and sending newsletters to your customers. According to their website, more than 2.5 million people use MailChimp to design email newsletters, share them on social networks, integrate with services you already use, and track your results.