HTML tags not supported when sending emails in Drupal 8 This is my code to sending email

   function hook_mail($key, &amp;$message, $params) {
     $options = array(
    'langcode' =&gt; $message['langcode'],
  );

  switch ($key) {
    case 'create_article':
      $message['from'] = \Drupal::config('system.site')-&gt;get('mail');
      // $message['headers']['Cc'] = $params['cc'];

      $message['subject'] = 'SUBJECT';
      $message['body'][] = Markup::create($params['message']);
      break;
  }
}


Mails are getting without any issue.But some of the HTML tags are not supporting
Eg: HTML bold,italics....
I have also configured SMTP authentication.
You can't send HTML email with Drupal 8 "out of the box."

To send HTML email, you can use the Swift Mailer module, which has the following features:


  
  Sending e-mails directly through a SMTP server of your choice, a
  locally installed MTA agent such as sendmail or the mail functionality
  provided by PHP.
  Sending HTML (MIME) e-mails.
  Adding file attachments to e-mails.
  Adding inline images to e-mails.
  


The Commerce 2 documentation includes a tutorial on how to install and configure the Swift Mailer module.