This Add-on for Super Forms can add and update your subscribers. If the email address does not exist for the selected list, a new subscriber will be added. Optionally you can let the subscriber confirm their subscription by sending the default MailChimp confirmation email.
Demo https://codecanyon.net/item/super-forms-mailchimp-addon/14126404
Downloadhttps://www.filecad.com/iewS/Super-Forms---MailChimp-Add-on-v1.3.2.rar