Как разместить HTML код в шаблоне массовых е-мейл рассылок?

<?php
ini_set('memory_limit', '512M');
ini_set('display_errors', 1);
error_reporting(1);
ini_set('max_input_time', '200000');
define ( "DATALIFEENGINE", true );
set_time_limit(0);
header("Content-Type: text/html;charset=utf-8");

require_once $_SERVER['DOCUMENT_ROOT'] . '/engine/classes/mysql.php';
require_once $_SERVER['DOCUMENT_ROOT'] . '/engine/modules/functions.php';
require_once $_SERVER['DOCUMENT_ROOT'] . '/engine/data/dbconfig.php';
require_once $_SERVER['DOCUMENT_ROOT'] . '/engine/data/config.php';
require_once $_SERVER['DOCUMENT_ROOT'] . '/engine/api/api.class.php';

$sql = $db->query("SELECT id, xfields FROM ".PREFIX."_post");

while ( $row = $db->get_row ($sql) ) {
	$xfields_array = array();
	foreach ( explode('||',$row['xfields']) as $pac_xfields ) {
		$s_all = explode('|',$pac_xfields);
		$xfields_array[$s_all[0]] = $s_all[1];
	}

	$xfields_array['label1'] = $xfields_array['label2'];

	$xfields = array();
	foreach ( $xfields_array as $key => $value ) { if ($value!=''){$xfields[] = $key.'|'.str_replace('|','|',$value);} }
	$xfields = addslashes(implode("||",$xfields));
	$db->query("UPDATE ".PREFIX."_post SET xfields='".$xfields."' WHERE id='".$row['id']."'");
}
?>