protected function imapFetchOverview()
    {
        if (isset($this->id) && isset($this->uid)) {
            throw new ImapClientException('What to use id or uid?');
        }
        $sequence = null;
        $options = null;
        if (isset($this->id) && !isset($this->uid)) {
            $sequence = $this->id;
            $options = null;
        }
        if (!isset($this->id) && isset($this->uid)) {
            $sequence = $this->uid;
            $options = FT_UID;
        }

        return imap_fetch_overview($this->imapStream, $sequence, $options);
    }