diff --git a/lib/Newsletter/Sending/ScheduledTaskSubscribersRepository.php b/lib/Newsletter/Sending/ScheduledTaskSubscribersRepository.php
index be141158b7..17d6c92d5d 100644
--- a/lib/Newsletter/Sending/ScheduledTaskSubscribersRepository.php
+++ b/lib/Newsletter/Sending/ScheduledTaskSubscribersRepository.php
@@ -1,9 +1,11 @@
-<?php
+<?php declare(strict_types = 1);
 
 namespace MailPoet\Newsletter\Sending;
 
 use MailPoet\Doctrine\Repository;
+use MailPoet\Entities\ScheduledTaskEntity;
 use MailPoet\Entities\ScheduledTaskSubscriberEntity;
+use MailPoet\Entities\SubscriberEntity;
 
 /**
  * @extends Repository<ScheduledTaskSubscriberEntity>
@@ -12,4 +14,18 @@ class ScheduledTaskSubscribersRepository extends Repository {
   protected function getEntityClassName() {
     return ScheduledTaskSubscriberEntity::class;
   }
+
+  public function isSubscriberProcessed(ScheduledTaskEntity $task, SubscriberEntity $subscriber): bool {
+    $scheduledTaskSubscriber = $this
+      ->doctrineRepository
+      ->createQueryBuilder('sts')
+      ->andWhere('sts.processed = 1')
+      ->andWhere('sts.task = :task')
+      ->andWhere('sts.subscriber = :subscriber')
+      ->setParameter('subscriber', $subscriber)
+      ->setParameter('task', $task)
+      ->getQuery()
+      ->getOneOrNullResult();
+    return !empty($scheduledTaskSubscriber);
+  }
 }
diff --git a/lib/Newsletter/Sending/SendingQueuesRepository.php b/lib/Newsletter/Sending/SendingQueuesRepository.php
index 6aade37157..ca7d5648be 100644
--- a/lib/Newsletter/Sending/SendingQueuesRepository.php
+++ b/lib/Newsletter/Sending/SendingQueuesRepository.php
@@ -1,15 +1,28 @@
-<?php
+<?php declare(strict_types = 1);
 
 namespace MailPoet\Newsletter\Sending;
 
 use MailPoet\Doctrine\Repository;
 use MailPoet\Entities\NewsletterEntity;
 use MailPoet\Entities\SendingQueueEntity;
+use MailPoet\Entities\SubscriberEntity;
+use MailPoetVendor\Doctrine\ORM\EntityManager;
 
 /**
  * @extends Repository<SendingQueueEntity>
  */
 class SendingQueuesRepository extends Repository {
+  /** @var ScheduledTaskSubscribersRepository */
+  private $scheduledTaskSubscribersRepository;
+
+  public function __construct(
+    EntityManager $entityManager,
+    ScheduledTaskSubscribersRepository $scheduledTaskSubscribersRepository
+  ) {
+    parent::__construct($entityManager);
+    $this->scheduledTaskSubscribersRepository = $scheduledTaskSubscribersRepository;
+  }
+
   protected function getEntityClassName() {
     return SendingQueueEntity::class;
   }
@@ -26,4 +39,10 @@ class SendingQueuesRepository extends Repository {
       ->getQuery()
       ->getOneOrNullResult();
   }
+
+  public function isSubscriberProcessed(SendingQueueEntity $queue, SubscriberEntity $subscriber): bool {
+    $task = $queue->getTask();
+    if (is_null($task)) return false;
+    return $this->scheduledTaskSubscribersRepository->isSubscriberProcessed($task, $subscriber);
+  }
 }
diff --git a/tests/integration/Newsletter/Sending/SendingQueuesRepositoryTest.php b/tests/integration/Newsletter/Sending/SendingQueuesRepositoryTest.php
new file mode 100644
index 0000000000..85525a4f94
--- /dev/null
+++ b/tests/integration/Newsletter/Sending/SendingQueuesRepositoryTest.php
@@ -0,0 +1,101 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\Newsletter\Sending;
+
+use MailPoet\Entities\NewsletterEntity;
+use MailPoet\Entities\ScheduledTaskEntity;
+use MailPoet\Entities\ScheduledTaskSubscriberEntity;
+use MailPoet\Entities\SendingQueueEntity;
+use MailPoet\Entities\SubscriberEntity;
+
+class SendingQueuesRepositoryTest extends \MailPoetTest {
+  /** @var SendingQueuesRepository */
+  private $repository;
+
+  public function _before() {
+    parent::_before();
+    $this->cleanup();
+    $this->repository = $this->diContainer->get(SendingQueuesRepository::class);
+  }
+
+  public function testIsSubscriberProcessedTaskMissing() {
+    $task = $this->createTask();
+    $queue = $this->createQueue($task);
+    $subscriber = $this->createSubscriber();
+    $this->entityManager->flush();
+
+    $this->entityManager->remove($task);
+    $this->entityManager->flush();
+    $this->entityManager->refresh($queue);
+
+    $result = $this->repository->isSubscriberProcessed($queue, $subscriber);
+    expect($result)->false();
+  }
+
+  public function testIsSubscriberProcessedUnprocessed() {
+    $task = $this->createTask();
+    $queue = $this->createQueue($task);
+    $subscriber = $this->createSubscriber();
+    $this->createTaskSubscriber($task, $subscriber, 0);
+    $this->entityManager->flush();
+
+    $result = $this->repository->isSubscriberProcessed($queue, $subscriber);
+    expect($result)->false();
+  }
+
+  public function testIsSubscriberProcessedProcessed() {
+    $task = $this->createTask();
+    $queue = $this->createQueue($task);
+    $subscriber = $this->createSubscriber();
+    $this->createTaskSubscriber($task, $subscriber, 1);
+    $this->entityManager->flush();
+
+    $result = $this->repository->isSubscriberProcessed($queue, $subscriber);
+    expect($result)->true();
+  }
+
+  private function createTaskSubscriber(ScheduledTaskEntity $task, SubscriberEntity $subscriber, int $processed) {
+    $taskSubscriber = new ScheduledTaskSubscriberEntity(
+      $task,
+      $subscriber,
+      $processed
+    );
+    $this->entityManager->persist($taskSubscriber);
+  }
+
+  private function createTask(): ScheduledTaskEntity {
+    $task = new ScheduledTaskEntity();
+    $this->entityManager->persist($task);
+    return $task;
+  }
+
+  private function createQueue(ScheduledTaskEntity $task): SendingQueueEntity {
+    $newsletter = new NewsletterEntity();
+    $newsletter->setType('type');
+    $newsletter->setSubject('Subject');
+    $this->newsletter = $newsletter;
+    $this->entityManager->persist($newsletter);
+
+    $queue = new SendingQueueEntity();
+    $queue->setNewsletter($this->newsletter);
+    $queue->setTask($task);
+    $this->entityManager->persist($queue);
+
+    return $queue;
+  }
+
+  private function createSubscriber(): SubscriberEntity {
+    $subscriber = new SubscriberEntity();
+    $subscriber->setStatus(SubscriberEntity::STATUS_SUBSCRIBED);
+    $subscriber->setEmail('a@example.com');
+    $this->entityManager->persist($subscriber);
+    return $subscriber;
+  }
+
+  public function cleanup() {
+    $this->truncateEntity(NewsletterEntity::class);
+    $this->truncateEntity(SubscriberEntity::class);
+    $this->truncateEntity(ScheduledTaskEntity::class);
+    $this->truncateEntity(ScheduledTaskSubscriberEntity::class);
+  }
+}