JV-MailChimp provides a Joomla - MailChimp integration. With JV-MailChimp you can add a 'Subscribe to Newsletter' option in the Joomla user registration form (create account page). We dont have a demo page showing JV-MailChimp in action, as it works with the registration screen and our demo site does not allow new user registrations (to prevent demo site abuse). Hence we have included screenshots of the same below:
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