diff --git a/mailpoet/lib/DI/ContainerConfigurator.php b/mailpoet/lib/DI/ContainerConfigurator.php
index b4701ca0c5..ef0633d742 100644
--- a/mailpoet/lib/DI/ContainerConfigurator.php
+++ b/mailpoet/lib/DI/ContainerConfigurator.php
@@ -336,10 +336,11 @@ class ContainerConfigurator implements IContainerConfigurator {
     $container->autowire(\MailPoet\EmailEditor\Engine\EmailEditor::class)->setPublic(true);
     $container->autowire(\MailPoet\EmailEditor\Engine\EmailApiController::class)->setPublic(true);
     $container->autowire(\MailPoet\EmailEditor\Engine\SettingsController::class)->setPublic(true);
+    $container->autowire(\MailPoet\EmailEditor\Engine\Renderer\Preprocessors\TopLevelPreprocessor::class)->setPublic(true);
     $container->autowire(\MailPoet\EmailEditor\Engine\Renderer\Renderer::class)->setPublic(true);
     $container->autowire(\MailPoet\EmailEditor\Engine\Renderer\BlocksRenderer::class)->setPublic(true);
     $container->autowire(\MailPoet\EmailEditor\Engine\Renderer\BlocksRegistry::class)->setPublic(true);
-    $container->autowire(\MailPoet\EmailEditor\Engine\Renderer\Preprocessor::class)->setPublic(true);
+    $container->autowire(\MailPoet\EmailEditor\Engine\Renderer\PreprocessManager::class)->setPublic(true);
     $container->autowire(\MailPoet\EmailEditor\Engine\StylesController::class)->setPublic(true);
     $container->autowire(\MailPoet\EmailEditor\Integrations\Core\Initializer::class)->setPublic(true);
     $container->autowire(\MailPoet\EmailEditor\Integrations\MailPoet\EmailEditor::class)->setPublic(true);
diff --git a/mailpoet/lib/EmailEditor/Engine/Renderer/PreprocessManager.php b/mailpoet/lib/EmailEditor/Engine/Renderer/PreprocessManager.php
new file mode 100644
index 0000000000..1e4570f6ef
--- /dev/null
+++ b/mailpoet/lib/EmailEditor/Engine/Renderer/PreprocessManager.php
@@ -0,0 +1,32 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\EmailEditor\Engine\Renderer;
+
+use MailPoet\EmailEditor\Engine\Renderer\Preprocessors\Preprocessor;
+use MailPoet\EmailEditor\Engine\Renderer\Preprocessors\TopLevelPreprocessor;
+
+class PreprocessManager {
+  /** @var Preprocessor[] */
+  private $preprocessors = [];
+
+  public function __construct(
+    TopLevelPreprocessor $topLevelPreprocessor
+  ) {
+    $this->registerPreprocessor($topLevelPreprocessor);
+  }
+
+  /**
+   * @param array $parsedBlocks
+   * @return array
+   */
+  public function preprocess(array $parsedBlocks): array {
+    foreach ($this->preprocessors as $preprocessor) {
+      $parsedBlocks = $preprocessor->preprocess($parsedBlocks);
+    }
+    return $parsedBlocks;
+  }
+
+  public function registerPreprocessor(Preprocessor $preprocessor): void {
+    $this->preprocessors[] = $preprocessor;
+  }
+}
diff --git a/mailpoet/lib/EmailEditor/Engine/Renderer/Preprocessors/Preprocessor.php b/mailpoet/lib/EmailEditor/Engine/Renderer/Preprocessors/Preprocessor.php
new file mode 100644
index 0000000000..594878c8ca
--- /dev/null
+++ b/mailpoet/lib/EmailEditor/Engine/Renderer/Preprocessors/Preprocessor.php
@@ -0,0 +1,7 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\EmailEditor\Engine\Renderer\Preprocessors;
+
+interface Preprocessor {
+  public function preprocess(array $parsedBlocks): array;
+}
diff --git a/mailpoet/lib/EmailEditor/Engine/Renderer/Preprocessor.php b/mailpoet/lib/EmailEditor/Engine/Renderer/Preprocessors/TopLevelPreprocessor.php
similarity index 89%
rename from mailpoet/lib/EmailEditor/Engine/Renderer/Preprocessor.php
rename to mailpoet/lib/EmailEditor/Engine/Renderer/Preprocessors/TopLevelPreprocessor.php
index c35bf8d80d..0badd517f3 100644
--- a/mailpoet/lib/EmailEditor/Engine/Renderer/Preprocessor.php
+++ b/mailpoet/lib/EmailEditor/Engine/Renderer/Preprocessors/TopLevelPreprocessor.php
@@ -1,9 +1,8 @@
 <?php declare(strict_types = 1);
 
-namespace MailPoet\EmailEditor\Engine\Renderer;
-
-class Preprocessor {
+namespace MailPoet\EmailEditor\Engine\Renderer\Preprocessors;
 
+class TopLevelPreprocessor implements Preprocessor {
   const SINGLE_COLUMN_TEMPLATE = [
     'blockName' => 'core/columns',
     'attrs' => [],
@@ -14,16 +13,12 @@ class Preprocessor {
     ]],
   ];
 
-  public function preprocess(array $parsedBlocks): array {
-    return $this->addTopLevelColumns($parsedBlocks);
-  }
-
   /**
    * In the editor we allow putting content blocks directly into the root level of the email.
    * But for rendering purposes it is more convenient to have them wrapped in a single column.
    * This method walks through the first level of blocks and wraps non column blocks into a single column.
    */
-  private function addTopLevelColumns(array $parsedBlocks): array {
+  public function preprocess(array $parsedBlocks): array {
     $wrappedParsedBlocks = [];
     $nonColumnsBlocksBuffer = [];
     foreach ($parsedBlocks as $block) {
diff --git a/mailpoet/lib/EmailEditor/Engine/Renderer/Renderer.php b/mailpoet/lib/EmailEditor/Engine/Renderer/Renderer.php
index 026afa0e25..5e6857f1ac 100644
--- a/mailpoet/lib/EmailEditor/Engine/Renderer/Renderer.php
+++ b/mailpoet/lib/EmailEditor/Engine/Renderer/Renderer.php
@@ -14,8 +14,8 @@ class Renderer {
   /** @var BlocksRenderer */
   private $blocksRenderer;
 
-  /** @var Preprocessor */
-  private $preprocessor;
+  /** @var PreprocessManager */
+  private $preprocessManager;
 
   /** @var StylesController */
   private $stylesController;
@@ -28,12 +28,12 @@ class Renderer {
    */
   public function __construct(
     \MailPoetVendor\CSS $cssInliner,
-    Preprocessor $preprocessor,
+    PreprocessManager $preprocessManager,
     BlocksRenderer $blocksRenderer,
     StylesController $stylesController
   ) {
     $this->cssInliner = $cssInliner;
-    $this->preprocessor = $preprocessor;
+    $this->preprocessManager = $preprocessManager;
     $this->blocksRenderer = $blocksRenderer;
     $this->stylesController = $stylesController;
   }
@@ -42,7 +42,7 @@ class Renderer {
     $parser = new \WP_Block_Parser();
     $parsedBlocks = $parser->parse($post->post_content); // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
 
-    $parsedBlocks = $this->preprocessor->preprocess($parsedBlocks, $this->stylesController->getEmailLayoutStyles());
+    $parsedBlocks = $this->preprocessManager->preprocess($parsedBlocks);
     $renderedBody = $this->blocksRenderer->render($parsedBlocks);
 
     $styles = (string)file_get_contents(dirname(__FILE__) . '/' . self::TEMPLATE_STYLES_FILE);
diff --git a/mailpoet/tests/unit/EmailEditor/Engine/Renderer/PreprocessManagerTest.php b/mailpoet/tests/unit/EmailEditor/Engine/Renderer/PreprocessManagerTest.php
new file mode 100644
index 0000000000..530314f301
--- /dev/null
+++ b/mailpoet/tests/unit/EmailEditor/Engine/Renderer/PreprocessManagerTest.php
@@ -0,0 +1,20 @@
+<?php declare(strict_types = 1);
+
+namespace unit\EmailEditor\Engine\Renderer;
+
+use MailPoet\EmailEditor\Engine\Renderer\PreprocessManager;
+use MailPoet\EmailEditor\Engine\Renderer\Preprocessors\TopLevelPreprocessor;
+
+class PreprocessManagerTest extends \MailPoetUnitTest {
+  public function testItCallsPreprocessorsProperly(): void {
+    $topLevel = $this->createMock(TopLevelPreprocessor::class);
+    $topLevel->expects($this->once())->method('preprocess')->willReturn([]);
+
+    $secondPreprocessor = $this->createMock(TopLevelPreprocessor::class);
+    $secondPreprocessor->expects($this->once())->method('preprocess')->willReturn([]);
+
+    $preprocessManager = new PreprocessManager($topLevel);
+    $preprocessManager->registerPreprocessor($secondPreprocessor);
+    expect($preprocessManager->preprocess([]))->equals([]);
+  }
+}
diff --git a/mailpoet/tests/unit/EmailEditor/Engine/Renderer/PreprocessorTest.php b/mailpoet/tests/unit/EmailEditor/Engine/Renderer/Preprocessors/TopLevelPreprocessorTest.php
similarity index 89%
rename from mailpoet/tests/unit/EmailEditor/Engine/Renderer/PreprocessorTest.php
rename to mailpoet/tests/unit/EmailEditor/Engine/Renderer/Preprocessors/TopLevelPreprocessorTest.php
index e3bff60661..b3dfd3ad1b 100644
--- a/mailpoet/tests/unit/EmailEditor/Engine/Renderer/PreprocessorTest.php
+++ b/mailpoet/tests/unit/EmailEditor/Engine/Renderer/Preprocessors/TopLevelPreprocessorTest.php
@@ -1,8 +1,10 @@
 <?php declare(strict_types = 1);
 
-namespace MailPoet\EmailEditor\Engine\Renderer;
+namespace unit\EmailEditor\Engine\Renderer\Preprocessors;
 
-class PreprocessorTest extends \MailPoetUnitTest {
+use MailPoet\EmailEditor\Engine\Renderer\Preprocessors\TopLevelPreprocessor;
+
+class TopLevelPreprocessorTest extends \MailPoetUnitTest {
 
   private $paragraphBlock = [
     'blockName' => 'core/paragraph',
@@ -20,12 +22,12 @@ class PreprocessorTest extends \MailPoetUnitTest {
     ]],
   ];
 
-  /** @var Preprocessor */
+  /** @var TopLevelPreprocessor */
   private $preprocessor;
 
   public function _before() {
     parent::_before();
-    $this->preprocessor = new Preprocessor();
+    $this->preprocessor = new TopLevelPreprocessor();
   }
 
   public function testItWrapsSingleTopLevelBlockIntoColumns() {