public function isCommentSpam($permaLink, $content, $type, $author = '', $authorEmailAddress = '', $authorUri = '')
    {
        if ($this->settings['apiKey'] === '' || $this->settings['apiKey'] === null) {
            $this->systemLogger->log('Could not check comment for spam because no Akismet API key was provided in the settings.', LOG_DEBUG);

            return false;
        }

        $arguments = array(
            'permalink' => $permaLink,
            'comment_type' => $type,
            'comment_author' => $author,
            'comment_author_email' => $authorEmailAddress,
            'comment_author_url' => $authorUri,
            'comment_content' => $content
        );
        $response = $this->sendRequest('comment-check', $arguments);
        switch ($response->getContent()) {
            case 'true':
                $this->systemLogger->log(sprintf('Akismet determined that the given comment referring to content with permalink "%s" is spam.', $permaLink), LOG_INFO);

                return true;
            case 'false':
                $this->systemLogger->log(sprintf('Akismet determined that the given comment referring to content with permalink "%s" is not spam.', $permaLink), LOG_INFO);

                return false;
            default:
                throw new Exception\ConnectionException('API error: ' . $response->getContent() . ' ' . $response->getHeader('X-akismet-debug-help'), 1335192487);
        }
    }