code: public MimeMultipart getMimeMultipart() throws MessagingException,
              IOException, JAXBException {
          List<DataSource> bodyPartContents = createRequestBody();
          return toMimeMultipart(bodyPartContents);
  
      }
docs: Gets the mime multipart.
  
  @return the mime multipart
  @throws MessagingException
  the messaging exception
  @throws IOException
  Signals that an I/O exception has occurred.
  @throws JAXBException
  the jAXB exception