YA: Simple Html Email Form

<?php
/*

    YA Link:
        http://answers.yahoo.com/question/?qid=20110703175108AAWivtW


Remember that most FREE servers have mail() disabled or are blacklisted from major mail exchange servers. For more info read: http://www.gitlez-ans.co.cc/question/3 for more info

*/


function cleanInput($i){
    return str_replace(Array('to:','from:','bcc:','cc:','reply-to:'),'',trim($i));
}
if($_SERVER['REQUEST_METHOD'] === 'POST'){
    if(strlen($_POST['to_email']) === 0 || strlen($_POST['from_email']) === 0){
        die('Required Form Field(s) are missing. Please <a href="Javascript: history.go(-1);">Go Back</a> and correct the missing fields (Email Addresses).');
    }
    $email = Array();
    $email['to'] = $_POST['to_name'] . ' <' . $_POST['to_email'] . '>';
    $email['from'] = $_POST['from_name'] . ' <' . $_POST['from_email'] . '>';
    $email['subject'] = $_POST['subject'];
    $email['message'] = $_POST['message'];
    print_r($email);
    $email = array_map('cleanInput',$email);
    if(mail($email['to'],$email['subject'],$email['message'],'From: ' . $email['from'] . "\r\n")){
        die('Email Sent Successfully.');
    }else{
        die('Email Error');
    }
}

?>
<html>
    <head>
        <title>Simple Form Emailer</title>
        <style type="text/css">
            form {
                position: relative;
                margin: auto;
                width: 460px;
            }
        </style>
<body>
    <form method="POST">
        <fieldset name="to">
            <h3>Recipient</h3>
            Name: <input type="text" name="to_name" /><br />
            Email: <input type="text" name="to_email" />
        </fieldset>
        <fieldset name="from">
            <h3>Sender</h3>
            Name: <input type="text" name="from_name" /><br />
            Email: <input type="text" name="from_email" />
        </fieldset>
        <fieldset name="subject">
            <h3>Subject</h3>
            <input type="text" name="subject" style="width: 240px;" />
        </fieldset>
        <fieldset name="message">
            <h3>Message</h3>
            <textarea cols="50" rows="8" name="message"></textarea>
        </fieldset>
        <input type="submit" value="Send Email" />
    </form>
</body>
</html>