[Xenon]

PHP Code:

<?php
if ($_POST['do'] == 'send')
{
//start reusable script
$user = $_POST['user'];
$emails = $_POST['addy'];
$subject = "Subject";
$body = "Hi $user";
$from = "From: From@email\n";

$subject = addslashes($subject);
$body = addslashes($body);

mail($emails, $subject, $body, $from);
}
 ?>
<form action="name of your phpfile here" action="post">
<input type="hidden" name="do" value="send" />
<input type="text" name="user" value="username" /><br />
<input type="text" name="addy" value="who@where.com" />
<input type="submit" name="s" value="send" />
</form>

plain and simple