code: def open(self):
          
          if self.connection:
              # Nothing to do if the connection is already open.
              return False
          try:
              # If local_hostname is not specified, socket.getfqdn() gets used.
              # For performance, we use the cached FQDN for local_hostname.
              self.connection = smtplib.SMTP(
                  self.host, self.port, local_hostname=DNS_NAME.get_fqdn()
              )
              if self.use_tls:
                  self.connection.ehlo()
                  self.connection.starttls()
                  self.connection.ehlo()
              if self.username and self.password:
                  self.connection.login(self.username, self.password)
              return True
          except Exception as e:
              logger.error(
                  "Error trying to connect to server %s:%s: %s",
                  self.host,
                  self.port,
                  e,
              )
              if not self.fail_silently:
                  raise
docs: Ensure we have a connection to the email server.
  
          Returns whether or not a new connection was required (True or False).