Eu usei esse código para enviar email com anexo usando php, mas há algum erro no anexo desde que recebo um email e o anexo aparece no conteúdo. antes de usar o mesmo código e funcionou com sucesso. porque??

<?php
// sending email with attachments

    function sendEmail($to,$from,$file,$ext){

      $to = "[email protected]";
     $from = "[email protected]";
      $subject = "Translation Request";

  $random_hash = md5(date('r', time()));

  $headers = "From: [email protected]\r\nReply-To: [email protected]";

  $headers .= "\r\nContent-Type: multipart/mixed; boundary=\"PHP-mixed-".$random_hash."\"";

  $attachment = chunk_split(base64_encode(file_get_contents("Test.doc")));

  $output = "
        --PHP-mixed-$random_hash;
        Content-Type: multipart/alternative; boundary='PHP-alt-$random_hash'
        --PHP-alt-$random_hash
        Content-Type: text/plain; charset='iso-8859-1'
        Content-Transfer-Encoding: 7bit

        Hello World!
        This is the simple text version of the email message.

        --PHP-alt-$random_hash
        Content-Type: text/html; charset='iso-8859-1'
        Content-Transfer-Encoding: 7bit

        <h2>Hello World!</h2>
        <p>This is the <b>HTML</b> version of the email message.</p>

        --PHP-alt-$random_hash--

        --PHP-mixed-$random_hash
        Content-Type: application/doc; name=Test.doc
        Content-Transfer-Encoding: base64
        Content-Disposition: attachment

        $attachment
        --PHP-mixed-$random_hash--";
      $send =  @mail($to, $subject, $output, $headers);
  return $send;
  }
?>

por favor ajude