Signup form has stopped working

I have been using the signup form on my website for some time, it has worked well, up until this week.

I have received a couple of blank emails, so just ran a test, and that came through blank as well. See below.

From: [your-name] <[your-email]>
Subject: [your-subject]

—

The code in the signup form is…

<form class=”bft-front-form bft-vertical bft-inline-label” method=”post” action=”https://eusc.club/&#8221; onsubmit=”return BFTValidate(this);”>
<div class=”bft-form-group”><label>Name:</label> <input type=”text” name=”user_name”></div>
<div class=”bft-form-group”><label>Email:</label> <input type=”text” name=”email”></div>
<div class=”bft-form-group”><input type=”submit” value=”Register”></div>
<input type=”hidden” name=”bft” value=”register”>
</form>

<script type=”text/javascript” >
function BFTValidate(frm) {
if(frm.user_name.value == “”) {
alert(“Please fill in your name”);
frm.user_name.focus();
return false;
}

var email = frm.email.value;
if(email==”” || email.indexOf(“@”)<1 ||email.indexOf(“.”)<1) {
alert(“Please fill in valid email address”);
frm.email.focus();
return false;
}

return true;
}
</script>

The page I need help with: [log in to see the link]