New validation with jQuery doesn't send tha value - php

Question

I want to make two verifications to Emails.
First to verify if the email is accepted ( that it is not an incorrect mail like gimil.com homail.com ... etc) and second verification to know if email existed.
I try to do with this jQuery code
$('#signup').validate({
errorElement: 'span',
rules:{
Email: {
required: true,
email: true,
remote: {
url: '/verifiyEmail',
type: 'POST', //Or whatever
data: function(){
return $("#email").val(); // The value of the email field
},
dataType: "JSON",
dataFilter: function(responseData){
alert(responseData.message); // Or whatever
return responseData.isValid; // validation result
}
}
}
}
});
and the PHP code
if(isset($_POST['email'])){
$email = $_POST['email'];
$response = null;
$isInBlackList = Member::Accepted($email);
if($isBlackList){
// User is in the blacklist
$response = array("isValid"=>false, "message"=>"This email is blacklisted!"); // Initialize $response
}
else{
$alreadyExists = ! Member::($email); // You have to implement this.
if(!$alreadyExists){
// Email already exists
$response = array("isValid"=>false, "message"=>"This email is already in user"); // Initialize $response
}
else{
// We found a valid email
$response = array("isValid"=>true);
}
}
header('Content-Type: application/json');
echo json_encode($response);
}else{
$response = array("isValid"=>'error');
header('Content-Type: application/json');
echo json_encode($response);
}
And always the response is error, which means the Email is not being sent through the PHP code
Is there any solution?