protected function isKnownFeed()
    {
        if ($this->feedName === false) {
            return $this->failed("Parser did not set the required feedName value");
        }

        if (empty(config("{$this->configBase}.feeds.{$this->feedName}"))) {
            $this->warningCount++;
            Log::warning(
                get_class($this) . ': ' .
                "The feed referred as '{$this->feedName}' is not configured in the parser " .
                config("{$this->configBase}.parser.name") .
                ' therefore skipping processing of this e-mail'
            );
            return false;
        }

        return true;
    }