diff --git a/lib/API/JSON/ResponseBuilders/NewslettersResponseBuilder.php b/lib/API/JSON/ResponseBuilders/NewslettersResponseBuilder.php
new file mode 100644
index 0000000000..b262952b20
--- /dev/null
+++ b/lib/API/JSON/ResponseBuilders/NewslettersResponseBuilder.php
@@ -0,0 +1,93 @@
+<?php
+
+namespace MailPoet\API\JSON\ResponseBuilders;
+
+use MailPoet\Entities\NewsletterEntity;
+use MailPoet\Entities\SegmentEntity;
+use MailPoet\Entities\SendingQueueEntity;
+
+class NewslettersResponseBuilder {
+  const DATE_FORMAT = 'Y-m-d H:i:s';
+
+  function build(NewsletterEntity $newsletter) {
+    return [
+      'id' => (string)$newsletter->getId(), // (string) for BC
+      'hash' => $newsletter->getHash(),
+      'subject' => $newsletter->getSubject(),
+      'type' => $newsletter->getType(),
+      'sender_address' => $newsletter->getSenderAddress(),
+      'sender_name' => $newsletter->getSenderName(),
+      'status' => $newsletter->getStatus(),
+      'reply_to_address' => $newsletter->getReplyToAddress(),
+      'reply_to_name' => $newsletter->getReplyToName(),
+      'preheader' => $newsletter->getPreheader(),
+      'body' => $newsletter->getBody(),
+      'sent_at' => ($sent_at = $newsletter->getSentAt()) ? $sent_at->format(self::DATE_FORMAT) : null,
+      'created_at' => $newsletter->getCreatedAt()->format(self::DATE_FORMAT),
+      'updated_at' => $newsletter->getUpdatedAt()->format(self::DATE_FORMAT),
+      'deleted_at' => ($deleted_at = $newsletter->getDeletedAt()) ? $deleted_at->format(self::DATE_FORMAT) : null,
+      'parent_id' => ($parent = $newsletter->getParent()) ? $parent->getId() : null,
+      'segments' => $this->buildSegments($newsletter),
+      'options' => $this->buildOptions($newsletter),
+      'queue' => ($queue = $newsletter->getQueue()) ? $this->buildQueue($queue) : false, // false for BC
+      'unsubscribe_token' => $newsletter->getUnsubscribeToken(),
+    ];
+  }
+
+  private function buildSegments(NewsletterEntity $newsletter) {
+    $output = [];
+    foreach ($newsletter->getNewsletterSegments() as $newsletter_segment) {
+      $segment = $newsletter_segment->getSegment();
+      if ($segment->getDeletedAt()) {
+        continue;
+      }
+      $output[] = $this->buildSegment($segment);
+    }
+    return $output;
+  }
+
+  private function buildOptions(NewsletterEntity $newsletter) {
+    $output = [];
+    foreach ($newsletter->getOptions() as $option) {
+      $output[$option->getOptionField()->getName()] = $option->getValue();
+    }
+    return $output;
+  }
+
+  private function buildSegment(SegmentEntity $segment) {
+    return [
+      'id' => (string)$segment->getId(), // (string) for BC
+      'name' => $segment->getName(),
+      'type' => $segment->getType(),
+      'description' => $segment->getDescription(),
+      'created_at' => $segment->getCreatedAt()->format(self::DATE_FORMAT),
+      'updated_at' => $segment->getUpdatedAt()->format(self::DATE_FORMAT),
+      'deleted_at' => ($deleted_at = $segment->getDeletedAt()) ? $deleted_at->format(self::DATE_FORMAT) : null,
+    ];
+  }
+
+  private function buildQueue(SendingQueueEntity $queue) {
+    $task = $queue->getTask();
+
+    // the following crazy mix of '$queue' and '$task' comes from 'array_merge($task, $queue)'
+    // (MailPoet\Tasks\Sending) which means all equal-named fields will be taken from '$queue'
+    return [
+      'id' => (string)$queue->getId(), // (string) for BC
+      'type' => $task->getType(),
+      'status' => $task->getStatus(),
+      'priority' => (string)$task->getPriority(), // (string) for BC
+      'scheduled_at' => ($scheduled_at = $task->getScheduledAt()) ? $scheduled_at->format(self::DATE_FORMAT) : null,
+      'processed_at' => ($processed_at = $task->getProcessedAt()) ? $processed_at->format(self::DATE_FORMAT) : null,
+      'created_at' => $queue->getCreatedAt()->format(self::DATE_FORMAT),
+      'updated_at' => $queue->getUpdatedAt()->format(self::DATE_FORMAT),
+      'deleted_at' => ($deleted_at = $queue->getDeletedAt()) ? $deleted_at->format(self::DATE_FORMAT) : null,
+      'meta' => $queue->getMeta(),
+      'task_id' => (string)$queue->getTask()->getId(), // (string) for BC
+      'newsletter_id' => (string)$queue->getNewsletter()->getId(), // (string) for BC
+      'newsletter_rendered_subject' => $queue->getNewsletterRenderedSubject(),
+      'count_total' => (string)$queue->getCountTotal(), // (string) for BC
+      'count_processed' => (string)$queue->getCountProcessed(), // (string) for BC
+      'count_to_process' => (string)$queue->getCountToProcess(), // (string) for BC
+    ];
+  }
+}
diff --git a/lib/API/JSON/v1/Newsletters.php b/lib/API/JSON/v1/Newsletters.php
index 43791f46b2..71066266a4 100644
--- a/lib/API/JSON/v1/Newsletters.php
+++ b/lib/API/JSON/v1/Newsletters.php
@@ -5,6 +5,7 @@ namespace MailPoet\API\JSON\v1;
 use Carbon\Carbon;
 use MailPoet\API\JSON\Endpoint as APIEndpoint;
 use MailPoet\API\JSON\Error as APIError;
+use MailPoet\API\JSON\ResponseBuilders\NewslettersResponseBuilder;
 use MailPoet\Config\AccessControl;
 use MailPoet\Cron\CronHelper;
 use MailPoet\Cron\Workers\SendingQueue\Tasks\Newsletter as NewsletterQueueTask;
@@ -17,6 +18,7 @@ use MailPoet\Models\NewsletterTemplate;
 use MailPoet\Models\SendingQueue;
 use MailPoet\Models\Setting;
 use MailPoet\Models\Subscriber;
+use MailPoet\Newsletter\NewslettersRepository;
 use MailPoet\Newsletter\Renderer\Renderer;
 use MailPoet\Newsletter\Scheduler\Scheduler;
 use MailPoet\Newsletter\Url as NewsletterUrl;
@@ -51,13 +53,21 @@ class Newsletters extends APIEndpoint {
     'global' => AccessControl::PERMISSION_MANAGE_EMAILS,
   ];
 
+  /** @var NewslettersRepository */
+  private $newsletters_repository;
+
+  /** @var NewslettersResponseBuilder */
+  private $newsletters_response_builder;
+
   function __construct(
     Listing\BulkActionController $bulk_action,
     Listing\Handler $listing_handler,
     WPFunctions $wp,
     WCHelper $woocommerce_helper,
     SettingsController $settings,
-    AuthorizedEmailsController $authorized_emails_controller
+    AuthorizedEmailsController $authorized_emails_controller,
+    NewslettersRepository $newsletters_repository,
+    NewslettersResponseBuilder $newsletters_response_builder
   ) {
     $this->bulk_action = $bulk_action;
     $this->listing_handler = $listing_handler;
@@ -65,25 +75,28 @@ class Newsletters extends APIEndpoint {
     $this->woocommerce_helper = $woocommerce_helper;
     $this->settings = $settings;
     $this->authorized_emails_controller = $authorized_emails_controller;
+    $this->newsletters_repository = $newsletters_repository;
+    $this->newsletters_response_builder = $newsletters_response_builder;
   }
 
   function get($data = []) {
-    $id = (isset($data['id']) ? (int)$data['id'] : false);
-    $newsletter = Newsletter::findOne($id);
-    if ($newsletter instanceof Newsletter) {
-      $newsletter = $newsletter
-        ->withSegments()
-        ->withOptions()
-        ->withSendingQueue();
+    $newsletter = isset($data['id'])
+      ? $this->newsletters_repository->findOneById((int)$data['id'])
+      : null;
 
+    if ($newsletter) {
+      $response = $this->newsletters_response_builder->build($newsletter);
       $preview_url = NewsletterUrl::getViewInBrowserUrl(
         NewsletterUrl::TYPE_LISTING_EDITOR,
-        $newsletter,
+        (object)[
+          'id' => $newsletter->getId(),
+          'hash' => $newsletter->getHash(),
+        ],
         Subscriber::getCurrentWPUser()
       );
 
-      $newsletter = $this->wp->applyFilters('mailpoet_api_newsletters_get_after', $newsletter->asArray());
-      return $this->successResponse($newsletter, ['preview_url' => $preview_url]);
+      $response = $this->wp->applyFilters('mailpoet_api_newsletters_get_after', $response);
+      return $this->successResponse($response, ['preview_url' => $preview_url]);
     } else {
       return $this->errorResponse([
         APIError::NOT_FOUND => WPFunctions::get()->__('This email does not exist.', 'mailpoet'),
diff --git a/lib/DI/ContainerConfigurator.php b/lib/DI/ContainerConfigurator.php
index 1e9d6d91ed..131fdbcf6f 100644
--- a/lib/DI/ContainerConfigurator.php
+++ b/lib/DI/ContainerConfigurator.php
@@ -75,6 +75,8 @@ class ContainerConfigurator implements IContainerConfigurator {
     $container->autowire(\MailPoet\API\JSON\v1\SendingTaskSubscribers::class)->setPublic(true);
     $container->autowire(\MailPoet\API\JSON\v1\Setup::class)->setPublic(true);
     $container->autowire(\MailPoet\API\JSON\v1\Subscribers::class)->setPublic(true);
+    // API response builders
+    $container->autowire(\MailPoet\API\JSON\ResponseBuilders\NewslettersResponseBuilder::class);
     // Config
     $container->autowire(\MailPoet\Config\AccessControl::class)->setPublic(true);
     $container->autowire(\MailPoet\Config\Activator::class)->setPublic(true);
@@ -174,6 +176,7 @@ class ContainerConfigurator implements IContainerConfigurator {
     $container->autowire(\MailPoet\Subscription\Registration::class)->setPublic(true);
     // Newsletter
     $container->autowire(\MailPoet\Newsletter\AutomatedLatestContent::class)->setPublic(true);
+    $container->autowire(\MailPoet\Newsletter\NewslettersRepository::class);
     // Util
     $container->autowire(\MailPoet\Util\Cookies::class);
     $container->autowire(\MailPoet\Util\Url::class)->setPublic(true);
diff --git a/lib/Newsletter/NewslettersRepository.php b/lib/Newsletter/NewslettersRepository.php
new file mode 100644
index 0000000000..38fc07fa35
--- /dev/null
+++ b/lib/Newsletter/NewslettersRepository.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace MailPoet\Newsletter;
+
+use MailPoet\Entities\NewsletterEntity;
+use MailPoet\Doctrine\Repository;
+
+/**
+ * @method NewsletterEntity[] findBy(array $criteria, array $order_by = null, int $limit = null, int $offset = null)
+ * @method NewsletterEntity|null findOneBy(array $criteria, array $order_by = null)
+ * @method NewsletterEntity|null findOneById(mixed $id)
+ * @method void persist(NewsletterEntity $entity)
+ * @method void remove(NewsletterEntity $entity)
+ */
+class NewslettersRepository extends Repository {
+  protected function getEntityClassName() {
+    return NewsletterEntity::class;
+  }
+}
diff --git a/tests/integration/API/JSON/v1/NewslettersTest.php b/tests/integration/API/JSON/v1/NewslettersTest.php
index 9539cedcf0..cb62345747 100644
--- a/tests/integration/API/JSON/v1/NewslettersTest.php
+++ b/tests/integration/API/JSON/v1/NewslettersTest.php
@@ -8,6 +8,7 @@ use Codeception\Util\Fixtures;
 use Codeception\Util\Stub;
 use Helper\WordPressHooks as WPHooksHelper;
 use MailPoet\API\JSON\Response as APIResponse;
+use MailPoet\API\JSON\ResponseBuilders\NewslettersResponseBuilder;
 use MailPoet\Listing\BulkActionController;
 use MailPoet\Listing\Handler;
 use MailPoet\API\JSON\v1\Newsletters;
@@ -20,6 +21,7 @@ use MailPoet\Models\ScheduledTask;
 use MailPoet\Models\Segment;
 use MailPoet\Models\SubscriberSegment;
 use MailPoet\Models\SendingQueue;
+use MailPoet\Newsletter\NewslettersRepository;
 use MailPoet\Newsletter\Scheduler\Scheduler;
 use MailPoet\Newsletter\Url;
 use MailPoet\Router\Router;
@@ -126,7 +128,9 @@ class NewslettersTest extends \MailPoetTest {
       $wp,
       $this->makeEmpty(WCHelper::class),
       new SettingsController(),
-      $this->make(AuthorizedEmailsController::class, ['onNewsletterUpdate' => Expected::never()])
+      $this->make(AuthorizedEmailsController::class, ['onNewsletterUpdate' => Expected::never()]),
+      ContainerWrapper::getInstance()->get(NewslettersRepository::class),
+      ContainerWrapper::getInstance()->get(NewslettersResponseBuilder::class)
     );
     $response = $this->endpoint->get(['id' => $this->newsletter->id]);
     expect($response->status)->equals(APIResponse::STATUS_OK);
@@ -166,7 +170,9 @@ class NewslettersTest extends \MailPoetTest {
       $wp,
       $this->makeEmpty(WCHelper::class),
       new SettingsController(),
-      $this->make(AuthorizedEmailsController::class, ['onNewsletterUpdate' => Expected::once()])
+      $this->make(AuthorizedEmailsController::class, ['onNewsletterUpdate' => Expected::once()]),
+      ContainerWrapper::getInstance()->get(NewslettersRepository::class),
+      ContainerWrapper::getInstance()->get(NewslettersResponseBuilder::class)
     );
 
     $response = $this->endpoint->save($valid_data);
@@ -534,7 +540,9 @@ class NewslettersTest extends \MailPoetTest {
       $wp,
       $this->makeEmpty(WCHelper::class),
       new SettingsController(),
-      $this->make(AuthorizedEmailsController::class, ['onNewsletterUpdate' => Expected::never()])
+      $this->make(AuthorizedEmailsController::class, ['onNewsletterUpdate' => Expected::never()]),
+      ContainerWrapper::getInstance()->get(NewslettersRepository::class),
+      ContainerWrapper::getInstance()->get(NewslettersResponseBuilder::class)
     );
 
     $response = $this->endpoint->duplicate(['id' => $this->newsletter->id]);