title: How to let new and old subscribers sign up to a Mailchimp segment
body: <p>I have a landing page with a Mailchimp form. I need visitors, including already signed up users, to be able to sign up to this Mailchimp form linked to the same audience list, but onto a segment. The end goal is to have a segment that also includes emails signed up to the main list, in order to target emails interested only to the product on that landing page.</p>
  <p>The issue is that I cannot have a user already signed up to the main list, sign up to the landing page form segment. I cannot find any resource online on how to have a separate form on a landing page that allows any email to be added to the segment. Is the approach incorrect?</p>