Mail is not sending

I have been designing my personal website using WordPress 4.0 . My code was :

<?php
if(isset($_POST[‘submit’])){
if(empty($_POST[‘name’] )or empty($_POST[’email’]) or empty($_POST[‘message’])){
echo “<div class=’alert alert-danger alert-dismissable’ style=’font-size: 17.142857142857142px;’><button type=’button’ class=’close’ data-dismiss=’alert’ aria-hidden=’true’>×</button>Some fields are empty .</div>”;
}else if(filter_var($_POST[’email’] , FILTER_VALIDATE_EMAIL === false)){
echo “<div class=’alert alert-danger alert-dismissable’ style=’font-size: 17.142857142857142px;’><button type=’button’ class=’close’ data-dismiss=’alert’ aria-hidden=’true’>×</button>Please give us a valid E-mail address .</div>”;
}
else{
$name = htmlentities($_POST[‘name’]);
$email = htmlentities($_POST[’email’]);
$message = htmlentities($_POST[‘message’]);
$to = ‘[email protected]’;
$subject = ‘A new mail from my website ‘;
$headers = array(
‘From’ => “{{@email}}” . “\r\n”
);
$mail = mail($to ,$subject ,$message ,$headers);
}
if(!$mail){
echo “<div class=’alert alert-danger alert-dismissable’ style=’font-size: 17.142857142857142px;’><button type=’button’ class=’close’ data-dismiss=’alert’ aria-hidden=’true’>×</button>Something went wrong !</div>”;
}else{
echo “<div class=’alert alert-success’>Email successfully sent. Thank you for your message.</div>”;
}

}
?>

But it is not sending the mail . It is redirecting me to the 404 page . Please solve this problem . Link : https://www.omarmannan.net/contact-me/