@property
    def mailbox(self):
        if self._mailbox is None:
            self._mailbox = Mailbox()
        return self._mailbox
Turn off deferral of rules and apply the rules now.
dataset/ETHPy150Open concurrence/concurrence/lib/concurrence/core.py/Tasklet.mailbox--crossover with--dataset/ETHPy150Open openstack/neutron/neutron/agent/firewall.py/FirewallDriver.filter_defer_apply_off