def get_auth_system():
    global _auth_system
    with _auth_select_lock:
        if _auth_system is None:
            _auth_system = import_string(settings.AUTH_SYSTEM)()
        return _auth_system
called when e-mail has been sent
dataset/ETHPy150Open mitsuhiko/solace/solace/auth.py/get_auth_system--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/mail/relaymanager.py/ManagedRelayerMixin.sentMail