code: def sendmail(self, to, message):
          
  
          # If we were passed a bare string as the To: address, convert it to
          # a single element list.
          if isinstance(to, str):
              to = [ to, ]
  
          # Send one email with the appropriate recipient list.
          server = self._smtp_server()
          server.sendmail(self.get_rfc2822_address(), to, message)
          server.quit()
docs: Send mail to one or more recipients. The required arguments are a
          list of RFC 822 to-address strings (a bare string will be treated as a
          list with 1 address), and a message string.