HTML email not rendering when sent
<p>my html email welcome.tpl file is formatted corrected I tested it with putsmail and it the code below process and sends out the email but the HTML is not rendered. All i'm getting is the actually html source code in the email.</p>

<pre><code>$mime_boundary = 'Multipart_Boundary_x'.md5(time()).'x';        
$headers = "MIME-Version: 1.0" . "\r\n";
$headers.= "Content-Type: multipart/alternative; boundary=" .$mime_boundary. "\r\n";
$headers.= "Content-Transfer-Encoding: 7bit\r\n";
$headers.= "From: &lt;support@system.com&gt;" . "\r\n";
$headers.= "X-Sender-IP: $_SERVER[SERVER_ADDR]" . "\r\n";
$headers.= "Date: ".date('n/d/Y g:i A') . "\r\n";
$headers.= "Reply-To: my" . "\r\n";

$subject='New Reg';

$body.= "{$mime_boundary}\n";
$body.= "Content-Type: text/html; charset=iso-8859-2\n";
$body.= "Content-Transfer-Encoding: 7bit\n\n";
$body.= $html_content;
$body.= "\n\n";
$body.= "--{$mime_boundary}\n";

$html_content = file_get_contents('emails/welcome.tpl');
$body = str_replace("{Username}",$en['user'],$html_content);
mail($en['email'], $subject, $body, $headers);
</code></pre>
