I'm trying to create a contact form on my site, however I keep getting an error that has me kinda confused. I'm new to all this and could use a little bit of help understanding what I need to do.... Ok here is the error I get when I test the form: Warning: mail() [function.mail]: SMTP server response: 451 See http://pobox.com/~djb/docs/smtplf.html. in D:\Hosting\4347082\html\family_portal\sendeail.php on line 49 ......................................and here is my code.

[CODE]
<? include("main.php");



$ip = $_POST['ip'];
$httpref = $_POST['httpref'];
$httpagent = $_POST['httpagent'];
$visitor = $_POST['visitor'];
$visitormail = $_POST['visitormail'];
$notes = $_POST['notes'];
$attn = $_POST['attn'];


if (eregi('http:', $notes)) {
die ("Do NOT try that! ! ");
}
if(!$visitormail == "" && (!strstr($visitormail,"@") || !strstr($visitormail,".")))
{
echo "<h2>Use Back - Enter valid e-mail</h2>\n";
$badinput = "<h2>Feedback was NOT submitted</h2>\n";
echo $badinput;
die ("Go back! ! ");
}

if(empty($visitor) || empty($visitormail) || empty($notes )) {
echo "<h2>Use Back - fill in all fields</h2>\n";
die ("Use back! ! ");
}

$todayis = date("l, F j, Y, g:i a") ;

$attn = $attn ;
$subject = $attn;

$notes = stripcslashes($notes);

$message = " $todayis [EST] \n
Attention: $attn \n
Message: $notes \n
From: $visitor ($visitormail)\n
Additional Info : IP = $ip \n
Browser Info: $httpagent \n
Referral : $httpref \n
";

$from = "$visitormail\r\n";


mail("support@captainjustinpetty.com", $subject, $message, $from);

?>

<p align="center">
Date: <?php echo $todayis ?>
<br />
Thank You : <?php echo $visitor ?> ( <?php echo $visitormail ?> )
<br />

Attention: <?php echo $attn ?>
<br />
Message:<br />
<?php $notesout = str_replace("\r", "<br/>", $notes);
echo $notesout; ?>
<br />
<?php echo $ip ?>

<br /><br />
<a href="contact.php"> Next Page </a>
</p>
<? include("footer.php"); ?>
[CODE]

Thanks In Advance, Justin