docs: public boolean sendHtmlEmail(String toEmail, String subject, String content) {
  
          //
          // 这个类主要是设置邮件
          //
          MailSenderInfo mailInfo = new MailSenderInfo();
          mailInfo.setMailServerHost(emailProperties.getEmailHost());
          mailInfo.setMailServerPort(emailProperties.getEmailPort());
          mailInfo.setValidate(true);
          mailInfo.setUserName(emailProperties.getEmailUser());
          mailInfo.setPassword(emailProperties.getEmailPassword());// 您的邮箱密码
  
          mailInfo.setFromAddress(emailProperties.getFromEmail());
          mailInfo.setToAddress(toEmail);
  
          mailInfo.setSubject(subject);
          mailInfo.setContent(content);
  
          // 这个类主要来发送邮件
          return SimpleMailSender.sendHtmlMail(mailInfo);// 发送文体格式
      }