diff --git a/mailpoet/lib/Newsletter/NewsletterPostsRepository.php b/mailpoet/lib/Newsletter/NewsletterPostsRepository.php
index 73db453464..69bc61c4ca 100644
--- a/mailpoet/lib/Newsletter/NewsletterPostsRepository.php
+++ b/mailpoet/lib/Newsletter/NewsletterPostsRepository.php
@@ -12,4 +12,20 @@ class NewsletterPostsRepository extends Repository {
   protected function getEntityClassName() {
     return NewsletterPostEntity::class;
   }
+
+  /** @param int[] $ids */
+  public function deleteByNewsletterIds(array $ids): void {
+    $this->entityManager->createQueryBuilder()
+      ->delete(NewsletterPostEntity::class, 'p')
+      ->where('p.newsletter IN (:ids)')
+      ->setParameter('ids', $ids)
+      ->getQuery()
+      ->execute();
+
+    // delete was done via DQL, make sure the entities are also detached from the entity manager
+    $this->detachAll(function (NewsletterPostEntity $entity) use ($ids) {
+      $newsletter = $entity->getNewsletter();
+      return $newsletter && in_array($newsletter->getId(), $ids, true);
+    });
+  }
 }
diff --git a/mailpoet/lib/Newsletter/NewslettersRepository.php b/mailpoet/lib/Newsletter/NewslettersRepository.php
index ce1b55c71b..4b46b7167d 100644
--- a/mailpoet/lib/Newsletter/NewslettersRepository.php
+++ b/mailpoet/lib/Newsletter/NewslettersRepository.php
@@ -38,6 +38,7 @@ use MailPoetVendor\Doctrine\ORM\Query\Expr\Join;
  */
 class NewslettersRepository extends Repository {
   private LoggerFactory $loggerFactory;
+  private NewsletterPostsRepository $newsletterPostsRepository;
   private StatisticsClicksRepository $statisticsClicksRepository;
   private StatisticsNewslettersRepository $statisticsNewslettersRepository;
   private StatisticsOpensRepository $statisticsOpensRepository;
@@ -45,6 +46,7 @@ class NewslettersRepository extends Repository {
 
   public function __construct(
     EntityManager $entityManager,
+    NewsletterPostsRepository $newsletterPostsRepository,
     StatisticsClicksRepository $statisticsClicksRepository,
     StatisticsNewslettersRepository $statisticsNewslettersRepository,
     StatisticsOpensRepository $statisticsOpensRepository,
@@ -52,6 +54,7 @@ class NewslettersRepository extends Repository {
   ) {
     parent::__construct($entityManager);
     $this->loggerFactory = LoggerFactory::getInstance();
+    $this->newsletterPostsRepository = $newsletterPostsRepository;
     $this->statisticsClicksRepository = $statisticsClicksRepository;
     $this->statisticsNewslettersRepository = $statisticsNewslettersRepository;
     $this->statisticsOpensRepository = $statisticsOpensRepository;
@@ -399,11 +402,7 @@ class NewslettersRepository extends Repository {
       ", ['ids' => $ids], ['ids' => Connection::PARAM_INT_ARRAY]);
 
       // Delete newsletter posts
-      $postsTable = $entityManager->getClassMetadata(NewsletterPostEntity::class)->getTableName();
-      $entityManager->getConnection()->executeStatement("
-         DELETE np FROM $postsTable np
-         WHERE np.`newsletter_id` IN (:ids)
-      ", ['ids' => $ids], ['ids' => Connection::PARAM_INT_ARRAY]);
+      $this->newsletterPostsRepository->deleteByNewsletterIds($ids);
 
       // Delete newsletter options
       $optionsTable = $entityManager->getClassMetadata(NewsletterOptionEntity::class)->getTableName();