PHP-General - Sending mail from php file

i am working on a website in which user will fill a form and on click of submit button a mail will be sent to a particular email id..i am doing like this :

order.php
<form method="post" action="sendmail.php">
Email: <input name="email" type="text" />
Message:
<textarea name="message" rows="10" cols="30">
</textarea>
<input type="submit" />
</form>
sendmail.php

<?php
$email = $_POST['email'] ;
$message = $_POST['message'] ;
mail ("thakurit07@gmail.com", "Feedback form results", $message, "From: $email") ;
print "Congratulations your email has been sent";
?>

on click of submit button ...
i am getting following error:

Warning: mail() [function.mail]: Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() in C:\xampp\htdocs\ims\sendmail.php on line 12
Congratulations your email has been sent



can any one help....

Wow, that's a puzzler. No one's EVER seen that one before!