run php script to send html email, one address can accept it and one cannot?

[blackhorse]

I used the same php page to send e-mail to two addresses.

At the address A, after I received, the from field is empty. And it was supposed to be HTML, but in the e-mail I got all these html source codes instead of a html style e-mail.

The qmail was the mail-sever.

Received: from unknown (HELO www.xxx.xxx) (20x.9x.20x.5x)
by xxx-xxx-xx-xx.010-xxx.com with SMTP; 2 Mar 2006 09:45:30 -0000
Received: (qmail 2930 invoked by uid 48); 2 Mar 2006 01:43:32 -0800

At the address B, I received the html style email fine with the right email sender etc.

Received: from www.xxx.xxx ([20x.9x.20x.5x])
by l-daemon (Sun ONE Messaging Server 6.0 HotFix 1.01 (built Mar 15 2004))
with ESMTP id <0IVH0054SUYGLS10@l-daemon> for

So why the address A cannot receive the email right, but the address B can. The address A cannot recognize the email sender, but the address B can?

Plus, if i run the same script from another server, the address A will not have problem to receive the same e-mail (the only difference is that the script was run from another sever). Address A never had problems to receive the html email from other servers.

What is the problem?

Address A is on a qmail server.

[blackhorse]

<?
$email_subject="Product Information";

$email_from="[e-mail]";	
$reply_to="[e-mail]";
$return_path="[e-mail]";


$mail_to=$email;

$message_priority=3;


$personal_address=trim($personal_address);
$message_header=trim($message_header);

$message_body=implode('', file($message_body_html));
$message_body=trim($message_body);

$message_footer=trim($message_footer);

?>
<?php
//headers

$headers = "MIME-Version: 1.0\r\n"; 
$headers .= "Content-type: text/html; charset=iso-8859-1\r\n"; //content type
$headers .= "From: $email_from <$email_from>\r\n"; 
$headers .= "X-Sender: <$email_from>\r\n";	
$headers .= "Reply-To: <$reply_to>\r\n"; 
$headers .= "Return-Path: <$return_path>\r\n";
$headers .= "X-Priority: $message_priority\r\n"; //1 UrgentMessage, 3 Normal
//$headers .= "X-MSMail-Priority: High\r\n"; 
$headers .= "X-Mailer: PHP\r\n"; //mailer

$contenttype = "Content-Type: text/html\r\n";

?>
<?php

$message=$personal_address.$message_header.$message_body.$message_footer;
$message=wordwrap($message, 72);

$mailresult = mail($mail_to, $email_subject, $message, $headers, "-f $return_path");

?>

The problem is when I run this script at other servers to send email to address A and address B, they are fine.

Only when I run this script on one server, and then Address B will be fine, Address A cannot recognize the sender and the html e-mail shows all the html tags.

Help please!