docs: public void sendHtmlMail(String from, String[] to, String title, String text)
              throws AddressException, MessagingException {
  
          long start = System.currentTimeMillis();
  
          MimeMessage mimeMessage = mailSender.createMimeMessage();
          MimeMessageHelper messageHelper = new MimeMessageHelper(mimeMessage, true, "GBK");
  
          InternetAddress[] toArray = new InternetAddress[to.length];
          for (int i = 0; i < to.length; i++) {
              toArray[i] = new InternetAddress(to[i]);
          }
  
          messageHelper.setFrom(new InternetAddress(from));
          messageHelper.setTo(toArray);
          messageHelper.setSubject(title);
          messageHelper.setText(text, true);
          mimeMessage = messageHelper.getMimeMessage();
          mailSender.send(mimeMessage);
          long end = System.currentTimeMillis();
          LOG.info("send mail start:" + start + " end :" + end);
      }