Email signup on Upfront/Spirit

What is wrong with this code?
<form name="newsletter" class="newsletter-form" action="//bytique.us13.list-manage1.com/subscribe/post" method="post">
<input name="user-email" placeholder="Email address" value="" type="email">
<input name="u" value="6f7b3d7bae128dd4d7ab0e374" type="hidden">
<input name="id" value="2e891f2e51" type="hidden">
<input value="YES!" style="font-weight:bold;" type="submit">
</form>