CSV files stripped from email sent via PHP script

Our issue is as follows. Emails are sent to an SBS2003 server via a PHP script - the attachemtent is a simple CSV file. We can receive the file and are running Exchange 2007 however the recipient gets the following email both internally and via OWA. We also have the same problem when sending to another SBS2003 server. I have attached the PHP script.

Cheers Simon

MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="R***H***123"
Message-Id: <20080620075732.BE7E117D0679@123631-ftp1.urban*****.com>
Date: Fri, 20 Jun 2008 02:57:32 -0500 (CDT)
X-Spam: [F=0.4826833394; B=0.500(0); CM=0.500; MH=0.500(2008062003); R=0.600(10852012539); S=0.383(2008052701); SS=0.500; SC=none]
X-MAIL-FROM: <apache@123631-ftp1.urban*****.com>
X-SOURCE-IP: [74.***.126.***]
X-AnalysisOut: [v=1.0 c=1 a=yTYxI62HnN/3kBiX9mLl5Q==:17 a=8gbDEKxhH1KCzB_z]
X-AnalysisOut: [nYEA:9 a=vwKfExwf_oOp2VpywQwpY2dDrvsA:4 a=I7_3IfUV4NgA:10 ]
X-AnalysisOut: [a=IH9376qGKM7Ep32upmUA:9 a=-kqo6GrQS2aUI4clCXNGC5XcyqUA:4 ]
X-AnalysisOut: [a=O58u2wXj750A:10 a=4a0V8oAklmkA:10]
Return-Path: apache@123631-ftp1.urban*****.com
X-OriginalArrivalTime: 20 Jun 2008 07:57:34.0300 (UTC) FILETIME=[4C6531C0:01C8D2AB]

Please see the latest csv file attached.

--R***H***123

Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Please see the latest csv file attached.
--R***H***123
Content-Type: text/csv; name="real.csv"
Content-Transfer-Encoding: base64
Content-disposition: attachment; file="real.csv"
T1JERVIgTlVNQkVSLCBEQVRFIE9GIE9SREVSLCBTVE9DSyBDT0RFLCBRVFksIERFTElWRVJZIEFE
RFJFU1MgTElORSAxLCBERUxJVkVSWSBBRERSRVNTIExJTkUgMiwgREVMSVZFUlkgQUREUkVTUyBM
SU5FIDMsIERFTElWRVJZIEFERFJFU1MgTElORSA0LCBERUxJVkVSWSBBRERSRVNTIExJTkUgNSwg
UE9TVENPREUsIFRFTEVQSE9ORSwgRU1BSUwgQUREUkVTUwpPcmRlciBObzogMTIxMzk0Mjk4NDk3
NDEsIDIwLzA2LzA4LCBSSDFGMDAwNCwgMSwgTmljaG9sYSBHcmVlbiwgQmVlY2h3b29kIE5vcnRo
ZmllbGQgTGFuZSwgSGlnaGJ1cnRvbiwgSHVkZGVyc2ZpZWxkLCBVbml0ZWQgS2luZ2RvbSwgSGQ4
IDBxdCwgUGhvbmU6IDAxNDg0IDYwNjM5NSwgbmljaG9sYS5ncmVlbkB2aXJnaW4ubmV0Cg==
--R***H***123--

<?php
$to = "richard@urban*****.**"; 
$file_name = "real.csv";
$subject = "R*** H*** Orders";
 
$bound_text = "R***lH***1234";
$bound = "--".$bound_text."\r\n";
$bound_last = "--".$bound_text."--\r\n";
 
$headers = 	"From: do_not_reply@r***lh***.co.uk\r\n";
$headers .= "MIME-Version: 1.0\r\nContent-Type: multipart/mixed; boundary=\"$bound_text\"";
$message = "Please see the latest csv file attached.\r\n$bound";
$message .= "Content-Type: text/html; charset=\"iso-8859-1\"\r\n"
  	."Content-Transfer-Encoding: 7bit\r\n\r\n"
  	."Please see the latest csv file attached.\r\n"
  	.$bound;
$file = file_get_contents("/var/www/html/r***h***/" . $file_name);
$message .= "Content-Type: text/csv; name=\"$file_name\"\r\n"
  	."Content-Transfer-Encoding: base64\r\n"
  	."Content-disposition: attachment; file=\"$file_name\"\r\n\r\n"
  	.chunk_split(base64_encode($file))
  	.$bound_last;
 
mail($to, $subject, $message, $headers);	
?>

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