What is wrong with this function please?

["Robin Wilson" <robinwilson@xxxxxxxxxxxx>]

Hello

I'm trying to do a function that emails users and sends an attachment. But I 
think something is in the wrong order or something as when I send it 
Exchange discards it.

This is the function which I have put together from various sources:

I would really appreciate any help as I have been up half the night and got 
nowhere!
Thanks
Robin

function sendMail($to, $toName, $from, $fromName, $subject, $message, 
$uploadfile, $fileName, $fileType, $fileSize) {
$eol="\r\n";
 $mime_boundary=md5(time());

 # Common Headers
 $headers .= 'From: '. $fromName .' <'. $from .'>'.$eol;
 $headers .= 'Reply-To: '. $toName .' <'. $to .'>'.$eol;
 $headers .= 'Return-Path: '. $fromName.' <'. $from .'>'.$eol;    // these 
two to set reply address
 $headers .= "Message-ID: 
<".$mime_boundary."@".$_SERVER['SERVER_NAME'].">".$eol;
 $headers .= "X-Mailer: PHP v".phpversion().$eol;          // These two to 
help avoid spam-filters

 # Boundry for marking the split & Multitype Headers
 $headers .= 'MIME-Version: 1.0'.$eol;
 $headers .= "Content-Type: multipart/related; 
boundary=\"".$mime_boundary."\"".$eol;

$msg = " ";

if ($uploadfile != "") {
 # File for Attachment
      $file_name = substr($uploadfile, (strrpos($uploadfile, "/")+1));

      $handle=fopen($uploadfile, 'rb');
      $f_contents=fread($handle, $fileSize);
      $f_contents=chunk_split(base64_encode($f_contents));    //Encode The 
Data For Transition using base64_encode();
      fclose($handle);

      # Attachment
      $msg .= "--".$mime_boundary.$eol;
      $msg .= "Content-Type: ".$fileType."; name=\"".$file_name."\"".$eol;
      $msg .= "Content-Transfer-Encoding: base64".$eol;
      $msg .= "Content-Disposition: attachment; 
filename=\"".$file_name."\"".$eol.$eol; // !! This line needs TWO end of 
lines !! IMPORTANT !!
      $msg .= $f_contents.$eol.$eol;
}

# Setup for text OR html
  $msg .= "Content-Type: multipart/alternative".$eol;

  # Text Version
  $msg .= "--".$mime_boundary.$eol;
  $msg .= "Content-Type: text/plain; charset=iso-8859-1".$eol;
  $msg .= "Content-Transfer-Encoding: 8bit".$eol;
  $msg .= strip_tags(str_replace("<br>", "\n", $message)).$eol.$eol;

  # HTML Version
  $msg .= "Content-Type: text/html; charset=iso-8859-1".$eol;
  $msg .= "Content-Transfer-Encoding: 8bit".$eol;
  $msg .= $message.$eol.$eol;

  # Finished
  $msg .= "--".$mime_boundary."--".$eol.$eol;  // finish with two eol's for 
better security. see Injection.


// Mail it
mail($to, $subject, $msg, $headers);
} 

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