code: def send_password_change_message(self, user, base_url):
          
          subject = 'Change your password here'
          if 'password_change' in self.email_subjects.keys():
              subject = self.email_subjects['password_change']
  
          sender = current_app.config['MAIL_DEFAULT_SENDER']
          recipient = user.email
          link = '{url}/{link}/'.format(
              url=base_url.rstrip('/'),
              link=user.password_link
          )
          data = dict(link=link)
          html = render_template('user/mail/password-change.html', **data)
          txt = render_template('user/mail/password-change.txt', **data)
  
          mail.send(Message(
              subject=subject,
              recipients=[recipient],
              body=txt,
              html=html,
              sender=sender
          ))
docs: Send password change message