public function getTransportConfig($storeId)
    {
        $config = [
            'port' => $this->getSmtpPort($storeId),
            'auth' => 'login',
            'username' => $this->getSmtpUsername($storeId),
            'password' => $this->getSmtpPassword($storeId),
            'ssl' => 'tls',
        ];

        if ($this->isDebugEnabled($storeId)) {
            $this->_logger->debug('Mail transport config : ' . implode(',', $config));
        }

        return $config;
    }