diff --git a/lib/API/JSON/v1/Newsletters.php b/lib/API/JSON/v1/Newsletters.php
index c4d9b004b2..5871594cec 100644
--- a/lib/API/JSON/v1/Newsletters.php
+++ b/lib/API/JSON/v1/Newsletters.php
@@ -14,7 +14,6 @@ use MailPoet\Entities\NewsletterOptionFieldEntity;
 use MailPoet\Entities\SendingQueueEntity;
 use MailPoet\InvalidStateException;
 use MailPoet\Listing;
-use MailPoet\Models\Newsletter;
 use MailPoet\Newsletter\Listing\NewsletterListingRepository;
 use MailPoet\Newsletter\NewsletterSaveController;
 use MailPoet\Newsletter\NewslettersRepository;
@@ -255,27 +254,15 @@ class Newsletters extends APIEndpoint {
   }
 
   public function duplicate($data = []) {
-    $id = (isset($data['id']) ? (int)$data['id'] : false);
-    $newsletter = Newsletter::findOne($id);
+    $newsletter = $this->getNewsletter($data);
 
-    if ($newsletter instanceof Newsletter) {
-      $data = [
-        'subject' => sprintf(__('Copy of %s', 'mailpoet'), $newsletter->subject),
-      ];
-      $duplicate = $newsletter->duplicate($data);
-      $errors = $duplicate->getErrors();
-
-      if (!empty($errors)) {
-        return $this->errorResponse($errors);
-      } else {
-        $this->wp->doAction('mailpoet_api_newsletters_duplicate_after', $newsletter, $duplicate);
-        $duplicate = Newsletter::findOne($duplicate->id);
-        if(!$duplicate instanceof Newsletter) return $this->errorResponse();
-        return $this->successResponse(
-          $duplicate->asArray(),
-          ['count' => 1]
-        );
-      }
+    if ($newsletter instanceof NewsletterEntity) {
+      $duplicate = $this->newsletterSaveController->duplicate($newsletter);
+      $this->wp->doAction('mailpoet_api_newsletters_duplicate_after', $newsletter, $duplicate);
+      return $this->successResponse(
+        $this->newslettersResponseBuilder->build($duplicate),
+        ['count' => 1]
+      );
     } else {
       return $this->errorResponse([
         APIError::NOT_FOUND => __('This email does not exist.', 'mailpoet'),
diff --git a/lib/Entities/NewsletterEntity.php b/lib/Entities/NewsletterEntity.php
index 2ada2dd14f..ea646bcb04 100644
--- a/lib/Entities/NewsletterEntity.php
+++ b/lib/Entities/NewsletterEntity.php
@@ -2,6 +2,7 @@
 
 namespace MailPoet\Entities;
 
+use DateTimeImmutable;
 use DateTimeInterface;
 use MailPoet\Doctrine\EntityTraits\AutoincrementedIdTrait;
 use MailPoet\Doctrine\EntityTraits\CreatedAtTrait;
@@ -157,6 +158,15 @@ class NewsletterEntity {
     $this->queues = new ArrayCollection();
   }
 
+  public function __clone() {
+    // reset ID
+    $this->id = null;
+    // reset timestamps
+    $this->setCreatedAt(new DateTimeImmutable());
+    $this->setUpdatedAt(new DateTimeImmutable());
+    $this->setDeletedAt(null);
+  }
+
   /**
    * @return string|null
    */
diff --git a/lib/Newsletter/NewsletterSaveController.php b/lib/Newsletter/NewsletterSaveController.php
index 87abea81f2..8dd702c66a 100644
--- a/lib/Newsletter/NewsletterSaveController.php
+++ b/lib/Newsletter/NewsletterSaveController.php
@@ -5,6 +5,7 @@ namespace MailPoet\Newsletter;
 use MailPoet\Cron\Workers\SendingQueue\Tasks\Newsletter as NewsletterQueueTask;
 use MailPoet\Entities\NewsletterEntity;
 use MailPoet\Entities\NewsletterOptionEntity;
+use MailPoet\Entities\NewsletterOptionFieldEntity;
 use MailPoet\Entities\NewsletterSegmentEntity;
 use MailPoet\Entities\ScheduledTaskEntity;
 use MailPoet\Entities\SegmentEntity;
@@ -135,6 +136,56 @@ class NewsletterSaveController {
     return $newsletter;
   }
 
+  public function duplicate(NewsletterEntity $newsletter): NewsletterEntity {
+    $duplicate = clone $newsletter;
+
+    $duplicate->setSubject(sprintf(__('Copy of %s', 'mailpoet'), $newsletter->getSubject()));
+    // generate new unsubscribe token
+    $duplicate->setUnsubscribeToken($this->security->generateUnsubscribeTokenByEntity($duplicate));
+    // reset status
+    $duplicate->setStatus(NewsletterEntity::STATUS_DRAFT);
+    // reset hash
+    $duplicate->setHash(null);
+    // reset sent at date
+    $duplicate->setSentAt(null);
+
+    $this->newslettersRepository->persist($duplicate);
+    $this->newslettersRepository->flush();
+
+    // create relationships between duplicate and segments
+    foreach ($newsletter->getNewsletterSegments() as $newsletterSegment) {
+      $segment = $newsletterSegment->getSegment();
+      if (!$segment) {
+          continue;
+      }
+      $duplicateSegment = new NewsletterSegmentEntity($duplicate, $segment);
+      $duplicate->getNewsletterSegments()->add($duplicateSegment);
+      $this->newsletterSegmentRepository->persist($duplicateSegment);
+    }
+
+    // duplicate options
+    $ignoredOptions = [
+      NewsletterOptionFieldEntity::NAME_IS_SCHEDULED,
+      NewsletterOptionFieldEntity::NAME_SCHEDULED_AT,
+    ];
+    foreach ($newsletter->getOptions() as $newsletterOption) {
+      $optionField = $newsletterOption->getOptionField();
+      if (!$optionField) {
+        continue;
+      }
+      if (in_array($optionField->getName(), $ignoredOptions, true)) {
+        continue;
+      }
+      $duplicateOption = new NewsletterOptionEntity($duplicate, $optionField);
+      $duplicateOption->setValue($newsletterOption->getValue());
+      $duplicate->getOptions()->add($duplicateOption);
+      $this->newsletterOptionsRepository->persist($duplicateOption);
+    }
+    $this->newslettersRepository->flush();
+
+    return $duplicate;
+  }
+
   private function getNewsletter(array $data): NewsletterEntity {
     if (!isset($data['id'])) {
       throw new UnexpectedValueException();
diff --git a/tests/integration/API/JSON/v1/NewslettersTest.php b/tests/integration/API/JSON/v1/NewslettersTest.php
index 3b771a9d02..c0a800858d 100644
--- a/tests/integration/API/JSON/v1/NewslettersTest.php
+++ b/tests/integration/API/JSON/v1/NewslettersTest.php
@@ -11,6 +11,7 @@ use MailPoet\API\JSON\ResponseBuilders\NewslettersResponseBuilder;
 use MailPoet\API\JSON\v1\Newsletters;
 use MailPoet\Cron\CronHelper;
 use MailPoet\DI\ContainerWrapper;
+use MailPoet\Entities\NewsletterEntity;
 use MailPoet\Listing\Handler;
 use MailPoet\Models\Newsletter;
 use MailPoet\Models\NewsletterOption;
@@ -379,7 +380,7 @@ class NewslettersTest extends \MailPoetTest {
 
     $hookName = 'mailpoet_api_newsletters_duplicate_after';
     expect(WPHooksHelper::isActionDone($hookName))->true();
-    expect(WPHooksHelper::getActionDone($hookName)[0] instanceof Newsletter)->true();
+    expect(WPHooksHelper::getActionDone($hookName)[0] instanceof NewsletterEntity)->true();
 
     $response = $this->endpoint->duplicate(['id' => $this->postNotification->id]);
     expect($response->status)->equals(APIResponse::STATUS_OK);