8 – How to arabic emails are right aligned

In my drupal8 site iam using arabic email for signup,login,forgot password etc.I have get arabic email content.The email content is left aligned.I am using PHP Mailer in my site to sending emails.When i have tried with Mail Systems+Mime Mail+SMTP,then showing an error like “reply-to” is not set.Is there any possible to align arabic email content from right to left using default PHPMailer?