Multiple subscribes with Mailchimp

Hi everyone !

I am using the Easy Forms for MailChimp by YIKES plugin and would like to allow people to subscribe multiple times to my list. Is there a way to do that with Mailchimp ?
A little more explanation : I have some content only accessible after a Mailchimp form. The problem is, I don’t want someone to be denied the access because he is already subscribed to the list.
So, I want the form to accept any email address, new or existing, and to just merge the new account with the existing one in the case someone registers several times.

Does someone know how to do that ?

Thank you !