public function search($query = '*', $dateFrom = NULL, $dateTo = NULL, array $tags = array(), array $senders = array(), array $apiKeys = array(), $limit = 100) {
        return $this->request('search', array(
            'query' => $query,
            'date_from' => $dateFrom,
            'date_to' => $dateTo,
            'tags' => $tags,
            'senders' => $senders,
            'api_keys' => $apiKeys,
            'limit' => $limit
        ));
    }