String lineBreakChars,
                                      int lineLength)
    throws UnsupportedEncodingException
  {
    if (lineLength != 76)
      throw new UnimplementedException("Mime line length option");
    if (! lineBreakChars.equals("\r\n"))
      throw new UnimplementedException("Mime line break option");
    return MimeUtility.encodeWord(value, charset, scheme);
  }