'Open a network connection.
This method can be overwritten by backend implementations to
open a network connection.
It\'s up to the backend implementation to track the status of
a network connection if it\'s needed by the backend.
This method can be called by applications to force a single
network connection to be used when sending mails. See the
send_messages() method of the SMTP backend for a reference
implementation.
The default implementation does nothing.'

def open(self):

    pass
