protected function getSwiftMailerTransport()
	{
		if ( !$mailer = $this->mailer )
		{
			return null;
		}

		if ( !$swift_mailer = $mailer->getSwiftMailer() )
		{
			return null;
		}

		if ( !is_a( $swift_mailer, '\Swift_Mailer' ) )
		{
			return null;
		}

		return $swift_mailer->getTransport();
	}