I currently have a form that it is fully loaded from my Mailchimp Account. I configured it for display as a page using mailchimp configuration page (admin/config/services/mailchimp/signup). Then when I was trying to access it with no admin permissions I got
Not authorized to access this page message.
Access all Mailchimp Signup Pages permission to anonymous users fix this problem but it specify that have security implications and I think it is a wrong solution.
I searched all the drupal interface and was not able to find it on either side (Content, contact forms, etc...). This element it's only present on signup forms list (admin/config/services/mailchimp/signup) and there isn't any permissions configuration.