code: @Override
      public String sendMMS(String CorpNum, Message[] Messages, File file,
                            Date reserveDT, String UserID, String requestNum) throws PopbillException {
  
          return sendMMS(CorpNum, null, null, null, Messages, file, reserveDT, UserID, requestNum);
      }
docs: /*
  (non-Javadoc)
  @see com.popbill.api.MessageService#sendMMS(java.lang.String, com.popbill.api.message.Message[], java.io.File, java.util.Date, java.lang.String)