What is wrong with this function please?

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); }