Bypassing the spool

[sonjadeissenboeck]

Has anyone ever added a bypass for the spooling?
So far I got this:
if($bypassSpool) {
$spool = $this->mailer->getTransport()->getSpool();
$transport = \Swift_MailTransport::newInstance();
$spool->flushQueue($transport);
}

but it isn't picking up the flushQueue() function from the swiftmailer-bundle. I don't know how to access that? :)