public function findPendingSynchronisationList(MailingList $mailingList)
    {
        return $this->createQueryBuilder('s')
            ->innerjoin('s.mailingList', 'm')
            ->where('s.mailingList = :mailingList')
            ->andWhere('s.status = :pending OR s.status = :failed')
            ->setParameters([
                'mailingList' => $mailingList,
                'pending' => Subscription::STATUS_PENDING,
                'failed' => Subscription::STATUS_FAILED,
            ])
            ->getQuery()
            ->getResult();
    }