php email not sending

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PHP

email

This is my php code to send email. I got the massage 'Message was sent, you can send another one. But email is not sending.I am Using Cpanel to host my web site. Is there any special configurations to do this? I'm new to php. Please help me.

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<form action="mytest.php" method="post" id="contactform">
  <ol>
    <li>
      <label for="name">Your Name <span class="red">*</span></label>
      <input id="name" name="name" class="text" />
    </li>
    <li>
      <label for="email">Your email <span class="red">*</span></label>
      <input id="email" name="email" class="text" />
    </li>
    <li>
      <label for="subject">Subject</label>
      <input id="subject" name="subject" class="text" />
    </li>
    <li>
      <label for="message">Message <span class="red">*</span></label>
      <textarea id="message" name="message" rows="6" cols="50"></textarea>
    </li>
    <li class="buttons">
      <input type="image" name="imageField" id="imageField" src="images/send.gif" class="send" />
      <div class="clr"></div>
    </li>
  </ol>
</form> 


<?php

if(!$_POST) exit;

$email = $_POST['email'];

$errors=0;

if($errors==1) echo $error;
else{
    $email_from = $_POST['email'];
$email_from = "from@gmail.com";
$headers = "From: " . strip_tags( $_POST['name'] ) . "\r\n";

$mail_to_send_to = "to@gmail.com";
$your_feedbackmail = "from@gmail.com";
$sendflag = 'send';                       
if ( $sendflag == "send" )
        {
                $email = $_REQUEST['email'] ;
                $message = $_REQUEST['message'] ;
                $headers = "From: $your_feedbackmail" . "\r\n" . "Reply-To: $email" . "\r\n" ;
                $a = mail( $mail_to_send_to, "Feedback Form Results", $message, $headers );
                if ($a)
                {
                     print("Message was sent, you can send another one");
                } else {
                     print("Message wasn't sent, please check that you have changed emails in the bottom");
                }
        }
}
?>