This is my form source code.....

<form action ="datafeed.php" method="post">
 <pre><span>Give your views about the website.....</span><br>
 &nbsp;&nbsp;<span>Name:</span>    <input type ="text" name ="name"/><br>
 &nbsp;&nbsp;<span>Email-ID: </span><input type ="text" name="emaild"/><br>
 &nbsp;&nbsp;<span>Feedback:</span>
&nbsp;&nbsp;&nbsp;<textarea name ="fd" rows="5" cols="40"></textarea>
 <p><input type ="submit" name ="submit" value="Submit your feedback"/></p></pre>
 </div>
 </form>

and this datafeed.php file source code
<?php
if(isset($_POST['submit']))
{
$to="deepakchawla35@gmail.com";
$subject="this is feedback msg";
$fd = $_POST['fd'];
$emaild = $_POST['emaild'];
$name=$_POST['name'];
  mail($to,$subject,$fd,$emaild,$headers);
echo "Mr. "."$name\n";
}
else
{
echo "feedback not send";
}
if(empty($name)||empty($emaild)||empty($fd))
{
echo "you can't leave any field empty..";
exit(0);
}
else
{
echo "your feedback received...";
}
 ?>
Plzz bucky get me out from this error plzz.....
thanking you