code: def send_mail(self, subject, to, template, **template_ctx):
          
          if not self.mail:
              from warnings import warn
              warn('Attempting to send mail without the mail bundle installed! '
                   'Please install it, or fix your configuration.')
              return
  
          self.mail.send(subject, to, template, **dict(
              **self.security.run_ctx_processor('mail'),
              **template_ctx))
docs: Utility method to send mail with the `mail` template context.