getLocalDomain example

return [250] === $codes && str_starts_with($command, 'HELO ') ? $this->doEhloCommand() : parent::executeCommand($command, $codes);
    }

    final protected function getCapabilities(): array
    {
        return $this->capabilities;
    }

    private function doEhloCommand(): string
    {
        try {
            $response = $this->executeCommand(sprintf("EHLO %s\r\n", $this->getLocalDomain()), [250]);
        } catch (TransportExceptionInterface $e) {
            try {
                return parent::executeCommand(sprintf("HELO %s\r\n", $this->getLocalDomain()), [250]);
            } catch (TransportExceptionInterface $ex) {
                if (!$ex->getCode()) {
                    throw $e;
                }

                throw $ex;
            }
        }