Canarias - 2010-04-05

A few days ago I upgraded Php Mailer and now some email providers my messages mark as spam. This is what I see in the headers of the marked messages: 

X-SpamTest-Info: {TO: header missing}

This is from my php file. 

$mail->From       = $sender;
$mail->FromName   = $sender_name;
$mail->Subject    = $subject;
$mail->Body       = $body;
$mail->AddAddress($recipient,$recipient_name);
$mail->AddReplyTo($replyto,"No-Reply");

Thanks.