ปัญหาเรื่องการใช้งานโค้ด php mailer รบกวนผู้รู้ช่วยตอบด้วยนะครับ ขอบคุณครับ

****************** send mail*******************/
/* title . first_name . last_name . company . address . tel . fax . mobile . e_mail . comment */
$name=$_POST['title'].' '.$_POST['first_name'].' '.$_POST['last_name'] ;
$email=$_POST['e_mail'];

//$to  = ""[email protected]."" . ", " ; // note the comma
$to .= "[email protected]";

/* subject */
$subject = "Contact ".CONTACT_COMNAME."  by ".$name."\r\n";

/* message */
$message = "To.".CONTACT_COMNAME." \r\n\n";
$message .=" \t".$_POST['comment']."\r\n";
$message .=" \t".$_POST['company']."\r\n";
$message .=" \t Address : ".$_POST['address'].",".$_POST['tel'].",".$_POST['fax'].",".$_POST['mobile']." ".
"".$email ."\r\n";
/* To send HTML mail, you can set the Content-type header. */
$headers  = "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html; charset=tis-620\r\n";
/* additional headers */
$headers .= "To: ".CONTACT_COMNAME." <".CONTACT_EMAIL.">\r\n";
$headers .= "From: ".$name." <".$email.">\r\n";
/* and now mail it */
if (!(mail($to, $subject, $message, $headers))){
    $msgs='Con\'t Send mail'; 
}else{
    $msgs='Mission Complete';
}