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$transport = new \Swift_Transport_SpoolTransport(
            new \Swift_Events_SimpleEventDispatcher(),
            new \Swift_FileSpool(__DIR__)
        );

        // Create the Mailer using your created Transport
        $mailer = new \Swift_Mailer($transport);

        // Create a message
        $message = (new \Swift_Message('Wonderful Subject'))
            ->setFrom(['john@doe.com' => 'John Doe'])
            ->setTo(['receiver@domain.org', 'other@domain.org' => 'A name'])
            ->setBody('Here is the message itself')
        ;

        // Send the message
        $result = $mailer->send($message);