def connectionMade(self):
        """
        Wait for a greeting from the server after the connection has been made.

        Start the connection in the WELCOME state.
        """
        if self.timeout > 0:
            self.setTimeout(self.timeout)

        self.state = 'WELCOME'
        self._blockedQueue = []

        Wait for a greeting from the server after the connection has been made.

        Start the connection in the WELCOME state.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/mail/pop3client.py