src/Viserio/Component/Mail/TransportFactory.php
protected function createMailgunTransport(array $config): MailgunTransport
    {
        return new MailgunTransport(
            $this->getHttpClient($config),
            $config['secret'],
            $config['domain'],
            $config['base_url'] ?? null
        );
    }
protected function createMailgunTransport(array $config): MailgunTransport
    {
        return new MailgunTransport(
            $this->getHttpClient($config),
            $config['secret'],
            $config['domain'],
            $config['base_url'] ?? null
        );
    }
Create an instance of the Mailgun Swift Transport driver.

@param array $config

@return \Viserio\Component\Mail\Transport\MailgunTransport