docs: public SendEmailResponse sendEmail(String from, String displayName, String[] toAddr, String subject, String body,
              File...attachmentFiles) {
          SendEmailRequest request =
                  buildSendEmailRequest(from, from, from, toAddr, new String[] { "" }, new String[] { "" }, subject,
                          body, 1, 1);
          request = fillDisplayName(request, displayName);
          request = fillAttachment(request, attachmentFiles);
  
          return sendEmail(request);
      }