code: def open(self) -> bool:
          
          if self.connection:
              # Nothing to do if the connection is already open.
              return False
  
          connection_params = {'local_hostname': DNS_NAME.get_fqdn()}
          if self.timeout is not None:
              connection_params['timeout'] = self.timeout
          try:
              self.connection = smtplib.SMTP(self.host, self.port,
                                             **connection_params)
  
              # TLS
              context = ssl.SSLContext(self._protocol())
              if self.ssl_certfile:
                  context.load_cert_chain(certfile=self.ssl_certfile,
                                          keyfile=self.ssl_keyfile)
              self.connection.ehlo()
              self.connection.starttls(context=context)
              self.connection.ehlo()
              if self.username and self.password:
                  self.connection.login(self.username, self.password)
                  log.debug("Successful SMTP connection/login")
              else:
                  log.debug("Successful SMTP connection (without login)")
              return True
          except smtplib.SMTPException:
              log.debug("SMTP connection and/or login failed")
              if not self.fail_silently:
                  raise
docs: Ensures we have a connection to the email server. Returns whether or
          not a new connection was required (True or False).