Bolt\Configuration\Check\EmailSetup::setOptions PHP Method

    public function setOptions(array $options)
    {
        $this->options = array_merge($this->options, $options);
        // Turn off the spool as we're only sending one message, and we don't
        // want to flush via the event listener as that fires on
        // KernelEvents::TERMINATE and we are unable to trap the error.
        $this->app['swiftmailer.use_spool'] = false;
        return $this;
    }