Forward if the email is already in the list
-3
how can i query if the email adress is already in the list and if the email is in the list you should be redirected to an error page <div class="contact1"> <div class="container-contact1"> <div class="contact1-pic js-tilt" data-tilt> <img src="images/img-01.png" alt="IMG"> </div> <form action="https://runi.us7.list-manage.com/subscribe/LIST" method="post" class="contact1-form validate-form"> <img src="images/logo.png" alt="IMG" class="bild " width="300" height="10"> <div class="wrap-input1 validate-input" da