code: def email_message(
          self,
          recipient,  # type: Text
          subject_template,  # type: Text
          body_template,  # type: Text
          sender=None,  # type: Optional[AbstractUser]
          message_class=EmailMessage,
          **kwargs
      ):
          
          from_email = "%s %s <%s>" % (
              sender.first_name,
              sender.last_name,
              email.utils.parseaddr(settings.DEFAULT_FROM_EMAIL)[1],
          )
          reply_to = "%s %s <%s>" % (sender.first_name, sender.last_name, sender.email)
  
          headers = {"Reply-To": reply_to}
          kwargs.update({"sender": sender, "recipient": recipient})
  
          subject_template = loader.get_template(subject_template)
          body_template = loader.get_template(body_template)
  
          subject = subject_template.render(
              kwargs
          ).strip()  # Remove stray newline characters
  
          body = body_template.render(kwargs)
  
          return message_class(subject, body, from_email, [recipient], headers=headers)
docs: Returns an invitation email message. This can be easily overridden.
          For instance, to send an HTML message, use the EmailMultiAlternatives message_class
          and attach the additional conent.