contact form, message is not recived - php

Question

I need to make a contact form and I did, but when Im sending test message Im not reciving that message, I have check my email addres and test message never get there i also looked into spam folder but still no luck how to fix this? here is my code
<?php
$formMessage = "";
$senderName = "";
$senderEmail = "";
$senderMessage = "";
if ($_POST['username']) { // If the form is trying to post value of username field
// Gather the posted form variables into local PHP variables
$senderName = $_POST['username'];
$senderEmail = $_POST['email'];
$senderMessage = $_POST['msg'];
// Make sure certain vars are present or else we do not send email yet
if (!$senderName || !$senderEmail || !$senderMessage) {
$formMessage = "The form is incomplete, please fill in all fields.";
} else { // Here is the section in which the email actually gets sent
// Run any filtering here
$senderName = strip_tags($senderName);
$senderName = stripslashes($senderName);
$senderEmail = strip_tags($senderEmail);
$senderEmail = stripslashes($senderEmail);
$senderMessage = strip_tags($senderMessage);
$senderMessage = stripslashes($senderMessage);
and here is part which im not sure about
// End Filtering
$to = "test#gmail.com";
$from = "contact#your_website_here.com";
$subject = "You have a message from your website";
// Begin Email Message Body
$message = "
$senderMessage
$senderName
$senderEmail
";
// Set headers configurations
$headers = 'MIME-Version: 1.0' . "rn";
$headers .= "Content-type: textrn";
// Mail it now using PHP's mail function
mail($to, $subject, $message, $headers);
$formMessage = "Thanks, your message has been sent.";
$senderName = "";
$senderEmail = "";
$senderMessage = "";
} // close the else condition
} // close if (POST condition
?>
here is html form
<form id="form1" name="form1" method="post" action="contact.php">
<?php echo $formMessage; ?>
<br />
<br />
Your Name:<br />
<input name="username" type="text" id="username" size="36" maxlength="32" value="<?php echo $senderName; ?>" />
<br />
<br />
Your Email:
<br />
<input name="email" type="text" id="email" size="36" maxlength="32" value="<?php echo $senderEmail; ?>" />
<br />
<br />
Your Message:
<br />
<textarea name="msg" id="msg" cols="45" rows="5"><?php echo $senderMessage; ?> </textarea>
<br />
<br />
<br />
<input type="submit" name="button" id="button" value="Send Now" />
</form>