public function setSent($sendId)
    {
        $bind = [
            'send_status' => \Dotdigitalgroup\Email\Model\Campaign::SENT,
            'sent_at' => $this->datetime->gmtDate()
        ];
        $conn = $this->getConnection();
        $conn->update(
            $this->getMainTable(),
            $bind,
            ['send_id = ?' => $sendId]
        );
    }