Release 5.7.0

2025-02-11 12:23:42 +02:00
33 changed files with 321 additions and 418 deletions
--- a/mailpoet/assets/js/src/automation/integrations/mailpoet/steps/send-email/helper/is-transactional.ts
+++ b/mailpoet/assets/js/src/automation/integrations/mailpoet/steps/send-email/helper/is-transactional.ts
@@ -3,7 +3,6 @@ import { Step } from '../../../../../editor/components/automation/types';
 import { storeName } from '../../../../../editor/store';

 const transactionalTriggers = [
-  'mailpoet:custom-trigger',
  'woocommerce:order-status-changed',
  'woocommerce:order-created',
  'woocommerce:order-completed',
--- a/mailpoet/assets/js/src/global.d.ts
+++ b/mailpoet/assets/js/src/global.d.ts
@@ -39,13 +39,13 @@ interface JQuery {
 declare module '@woocommerce/blocks-checkout' {
  type CheckboxControlProps = {
    className?: string;
-    label?: string | React.ReactNode;
+    label?: string;
    id?: string;
-    onChange: (value: boolean) => void;
-    children?: React.ReactChildren;
+    instanceId?: string;
+    onChange?: (value: boolean) => void;
+    children?: React.ReactChildren | React.ReactElement;
    hasError?: boolean;
    checked?: boolean;
-    disabled?: string | boolean | undefined;
  };
  export const CheckboxControl: (props: CheckboxControlProps) => JSX.Element;
 }
--- a/mailpoet/assets/js/src/mailpoet-email-editor-integration/email-sidebar-extension.tsx
+++ b/mailpoet/assets/js/src/mailpoet-email-editor-integration/email-sidebar-extension.tsx
@@ -1,142 +0,0 @@
-import { ExternalLink } from '@wordpress/components';
-import { select, dispatch } from '@wordpress/data';
-import { store as coreDataStore, useEntityProp } from '@wordpress/core-data';
-import { store as editorStore } from '@wordpress/editor';
-import { __ } from '@wordpress/i18n';
-import { createInterpolateElement } from '@wordpress/element';
-import classnames from 'classnames';
-
-const previewTextMaxLength = 150;
-const previewTextRecommendedLength = 80;
-
-export function EmailSidebarExtensionBody({ RichTextWithButton }) {
-  const [mailpoetEmailData] = useEntityProp(
-    'postType',
-    'mailpoet_email',
-    'mailpoet_data',
-  );
-
-  const updateEmailMailPoetProperty = (name: string, value: string) => {
-    const postId = select(editorStore).getCurrentPostId();
-    const currentPostType = 'mailpoet_email'; // only for mailpoet_email post-type
-
-    const editedPost = select(coreDataStore).getEditedEntityRecord(
-      'postType',
-      currentPostType,
-      postId,
-    );
-
-    // @ts-expect-error Property 'mailpoet_data' does not exist on type 'Updatable<Attachment<any>>'.
-    const mailpoetData = editedPost?.mailpoet_data || {};
-    void dispatch(coreDataStore).editEntityRecord(
-      'postType',
-      currentPostType,
-      postId,
-      {
-        mailpoet_data: {
-          ...mailpoetData,
-          [name]: value,
-        },
-      },
-    );
-  };
-
-  const subjectHelp = createInterpolateElement(
-    __(
-      'Use personalization tags to personalize your email, or learn more about <bestPracticeLink>best practices</bestPracticeLink> and using <emojiLink>emoji in subject lines</emojiLink>.',
-      'mailpoet',
-    ),
-    {
-      bestPracticeLink: (
-        // eslint-disable-next-line jsx-a11y/anchor-has-content, jsx-a11y/control-has-associated-label
-        <a
-          href="https://www.mailpoet.com/blog/17-email-subject-line-best-practices-to-boost-engagement/"
-          target="_blank"
-          rel="noopener noreferrer"
-        />
-      ),
-      emojiLink: (
-        // eslint-disable-next-line jsx-a11y/anchor-has-content, jsx-a11y/control-has-associated-label
-        <a
-          href="https://www.mailpoet.com/blog/tips-using-emojis-in-subject-lines/"
-          target="_blank"
-          rel="noopener noreferrer"
-        />
-      ),
-    },
-  );
-
-  const previewTextLength = mailpoetEmailData?.preheader?.length ?? 0;
-
-  const preheaderHelp = createInterpolateElement(
-    __(
-      '<link>This text</link> will appear in the inbox, underneath the subject line.',
-      'mailpoet',
-    ),
-    {
-      link: (
-        // eslint-disable-next-line jsx-a11y/anchor-has-content, jsx-a11y/control-has-associated-label
-        <a
-          href={new URL(
-            'article/418-preview-text',
-            'https://kb.mailpoet.com/',
-          ).toString()}
-          key="preview-text-kb"
-          target="_blank"
-          rel="noopener noreferrer"
-        />
-      ),
-    },
-  );
-
-  return (
-    <>
-      <RichTextWithButton
-        attributeName="subject"
-        attributeValue={mailpoetEmailData?.subject}
-        updateProperty={updateEmailMailPoetProperty}
-        label={__('Subject', 'mailpoet')}
-        labelSuffix={
-          <ExternalLink href="https://kb.mailpoet.com/article/435-a-guide-to-personalisation-tags-for-tailored-newsletters#list">
-            {__('Guide', 'mailpoet')}
-          </ExternalLink>
-        }
-        help={subjectHelp}
-        placeholder={__('Eg. The summer sale is here!', 'mailpoet')}
-      />
-
-      <br />
-
-      <RichTextWithButton
-        attributeName="preheader"
-        attributeValue={mailpoetEmailData?.preheader}
-        updateProperty={updateEmailMailPoetProperty}
-        label={__('Preview text', 'mailpoet')}
-        labelSuffix={
-          <span
-            className={classnames(
-              'mailpoet-settings-panel__preview-text-length',
-              {
-                'mailpoet-settings-panel__preview-text-length-warning':
-                  previewTextLength > previewTextRecommendedLength,
-                'mailpoet-settings-panel__preview-text-length-error':
-                  previewTextLength > previewTextMaxLength,
-              },
-            )}
-          >
-            {previewTextLength}/{previewTextMaxLength}
-          </span>
-        }
-        help={preheaderHelp}
-        placeholder={__(
-          "Add a preview text to capture subscribers' attention and increase open rates.",
-          'mailpoet',
-        )}
-      />
-    </>
-  );
-}
-
-export function EmailSidebarExtension(RichTextWithButton: JSX.Element) {
-  return <EmailSidebarExtensionBody RichTextWithButton={RichTextWithButton} />;
-}
--- a/mailpoet/assets/js/src/mailpoet-email-editor-integration/index.ts
+++ b/mailpoet/assets/js/src/mailpoet-email-editor-integration/index.ts
@@ -5,7 +5,6 @@
 import { addFilter, addAction } from '@wordpress/hooks';
 import { MailPoet } from 'mailpoet';
 import { withSatismeterSurvey } from './satismeter-survey';
-import { EmailSidebarExtension } from './email-sidebar-extension';
 import './index.scss';
 import { useValidationRules } from './validate-email-content';

@@ -13,12 +12,10 @@ addFilter('mailpoet_email_editor_wrap_editor_component', 'mailpoet', (editor) =>
  withSatismeterSurvey(editor),
 );

-// validate email editor content using the defined validation rules
-// content is first validated when the "Send" button is clicked and revalidated on "Save Draft"
 addFilter(
  'mailpoet_email_editor_content_validation_rules',
  'mailpoet',
-  () => useValidationRules(), // returns a memorized set of rules (array of rules)
+  (validationRules: []) => [...validationRules, ...useValidationRules()],
 );

 const EVENTS_TO_TRACK = [
@@ -56,22 +53,3 @@ addFilter(
  'mailpoet',
  () => !!window.mailpoet_analytics_enabled,
 );
-
-// integration point for settings sidebar
-addFilter(
-  'mailpoet_email_editor_setting_sidebar_extension_component',
-  'mailpoet',
-  // eslint-disable-next-line @typescript-eslint/no-unsafe-return
-  (RichTextWithButton) => EmailSidebarExtension.bind(null, RichTextWithButton),
-);
-
-// use mailpoet data subject if available
-addFilter(
-  'mailpoet_email_editor_preferred_template_title',
-  'mailpoet',
-  (...args) => {
-    const [, post] = args;
-    // eslint-disable-next-line @typescript-eslint/no-unsafe-return
-    return post?.mailpoet_data?.subject || ''; // use MailPoet subject as title
-  },
-);
--- a/mailpoet/assets/js/src/mailpoet-email-editor-integration/validate-email-content.ts
+++ b/mailpoet/assets/js/src/mailpoet-email-editor-integration/validate-email-content.ts
@@ -64,14 +64,12 @@ export function useValidationRules() {
            label: __('Insert link', 'mailpoet'),
            onClick: () => {
              if (!hasFooter) {
-                // update the email content
                void dispatch(blockEditorStore).insertBlock(
                  linksParagraphBlock,
                  undefined,
                  contentBlockId,
                );
              } else {
-                // update the template
                void dispatch(coreDataStore).editEntityRecord(
                  'postType',
                  'wp_template',
--- a/mailpoet/assets/js/src/marketing-optin-block/block.tsx
+++ b/mailpoet/assets/js/src/marketing-optin-block/block.tsx
@@ -30,10 +30,8 @@ export function FrontendBlock({
  }

  return (
-    <CheckboxControl
-      checked={checked}
-      onChange={setChecked}
-      label={<RawHTML>{text || defaultText}</RawHTML>}
-    />
+    <CheckboxControl checked={checked} onChange={setChecked}>
+      <RawHTML>{text || defaultText}</RawHTML>
+    </CheckboxControl>
  );
 }
--- a/mailpoet/assets/js/src/marketing-optin-block/edit.tsx
+++ b/mailpoet/assets/js/src/marketing-optin-block/edit.tsx
@@ -56,11 +56,7 @@ export function Edit({
    <div {...blockProps}>
      {optinEnabled ? (
        <div className="wc-block-checkout__marketing">
-          <CheckboxControl
-            id="mailpoet-marketing-optin"
-            checked={false}
-            onChange={() => {}}
-          />
+          <CheckboxControl id="mailpoet-marketing-optin" checked={false} />
          <RichText
            value={currentText}
            onChange={(value) => setAttributes({ text: value })}
--- a/mailpoet/assets/js/src/nps-poll.jsx
+++ b/mailpoet/assets/js/src/nps-poll.jsx
@@ -41,36 +41,24 @@ export const initializeSatismeterSurvey = (writeId = null) => {
    } else {
      writeKey = oldUsersPollId;
    }
-    const traits = {
-      name: window.mailpoet_current_wp_user.user_nicename,
-      email: window.mailpoet_current_wp_user.user_email,
-      mailpoetVersion: window.mailpoet_version,
-      mailpoetPremiumIsActive: window.mailpoet_premium_active,
-      createdAt: trackingData.installedAtIso,
-      newslettersSent: trackingData.newslettersSent,
-      welcomeEmails: trackingData.welcomeEmails,
-      postnotificationEmails: trackingData.postnotificationEmails,
-      woocommerceEmails: trackingData.woocommerceEmails,
-      subscribers: trackingData.subscribers,
-      lists: trackingData.lists,
-      sendingMethod: trackingData.sendingMethod,
-      woocommerceIsInstalled: trackingData.woocommerceIsInstalled,
-      woocommerceVersion: trackingData.woocommerceVersion,
-      WordPressVersion: trackingData.WordPressVersion,
-      blockTheme: trackingData.blockTheme,
-      themeVersion: trackingData.themeVersion,
-      theme: trackingData.theme,
-    };
-    if (trackingData.gutenbergVersion) {
-      traits.gutenbergVersion = trackingData.gutenbergVersion;
-    }
-    if (trackingData.wooCommerceVersion) {
-      traits.wooCommerceVersion = trackingData.wooCommerceVersion;
-    }
    satismeter({
      writeKey,
      userId: window.mailpoet_current_wp_user.ID + window.mailpoet_site_url,
-      traits,
+      traits: {
+        name: window.mailpoet_current_wp_user.user_nicename,
+        email: window.mailpoet_current_wp_user.user_email,
+        mailpoetVersion: window.mailpoet_version,
+        mailpoetPremiumIsActive: window.mailpoet_premium_active,
+        createdAt: trackingData.installedAtIso,
+        newslettersSent: trackingData.newslettersSent,
+        welcomeEmails: trackingData.welcomeEmails,
+        postnotificationEmails: trackingData.postnotificationEmails,
+        woocommerceEmails: trackingData.woocommerceEmails,
+        subscribers: trackingData.subscribers,
+        lists: trackingData.lists,
+        sendingMethod: trackingData.sendingMethod,
+        woocommerceIsInstalled: trackingData.woocommerceIsInstalled,
+      },
      events: {
        submit: (response) => {
          if (response.rating >= 9 && response.completed) {
--- a/mailpoet/changelog.txt
+++ b/mailpoet/changelog.txt
@@ -1,9 +1,5 @@
 == Changelog ==

-= 5.7.1 - 2025-02-17 =
-* Improved: Apply get_the_excerpt filter to MailPoets post excerpts;
-* Fixed: conflict with Rank Math plugin breaking "Scheduled Actions" page.
-
 = 5.7.0 - 2025-02-11 =
 * Improved: Rename Review Trigger in Automations;
 * Changed: minimum required WooCommerce is 9.5;
--- a/mailpoet/composer.json
+++ b/mailpoet/composer.json
@@ -5,7 +5,7 @@
    "dragonmantank/cron-expression": "^3.3",
    "mailpoet/email-editor": "*",
    "mixpanel/mixpanel-php": "2.*",
-    "woocommerce/action-scheduler": "3.9.2"
+    "woocommerce/action-scheduler": "^3.8.0"
  },
  "require-dev": {
    "ext-gd": "*",
@@ -61,9 +61,6 @@
      "MailPoet\\Test\\DataGenerator\\": "tests/DataGenerator"
    }
  },
-  "replace": {
-    "soundasleep/html2text": "*"
-  },
  "scripts": {
    "pre-install-cmd": [
      "@php tools/install.php",
--- a/mailpoet/composer.lock
+++ b/mailpoet/composer.lock
@@ -4,7 +4,7 @@
        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
        "This file is @generated automatically"
    ],
-    "content-hash": "a95263a51332277e75d7147e3dc4551e",
+    "content-hash": "9957467448f215809ac9dc8fbcab2b00",
    "packages": [
        {
            "name": "dragonmantank/cron-expression",
@@ -73,11 +73,10 @@
            "dist": {
                "type": "path",
                "url": "../packages/php/email-editor",
-                "reference": "53577c5aa3a97e82c58284d48c3aa339cb2a15d4"
+                "reference": "311798cfd57b26bb5df1fc7f97b5732e45603419"
            },
            "require": {
-                "php": ">=7.4",
-                "soundasleep/html2text": "^2.1"
+                "php": ">=7.4"
            },
            "type": "library",
            "autoload": {
@@ -102,9 +101,6 @@
                ],
                "code-style-fix": [
                    "../../../mailpoet/tasks/code_sniffer/vendor/bin/phpcbf -p"
-                ],
-                "phpstan": [
-                    "php ./tasks/run-phpstan.php"
                ]
            },
            "description": "Email editor based on WordPress Gutenberg package.",
@@ -221,20 +217,20 @@
        },
        {
            "name": "woocommerce/action-scheduler",
-            "version": "3.9.2",
+            "version": "3.8.0",
            "source": {
                "type": "git",
                "url": "https://github.com/woocommerce/action-scheduler.git",
-                "reference": "efbb7953f72a433086335b249292f280dd43ddfe"
+                "reference": "99cd7981f51c98883082534d4852491858d72834"
            },
            "dist": {
                "type": "zip",
-                "url": "https://api.github.com/repos/woocommerce/action-scheduler/zipball/efbb7953f72a433086335b249292f280dd43ddfe",
-                "reference": "efbb7953f72a433086335b249292f280dd43ddfe",
+                "url": "https://api.github.com/repos/woocommerce/action-scheduler/zipball/99cd7981f51c98883082534d4852491858d72834",
+                "reference": "99cd7981f51c98883082534d4852491858d72834",
                "shasum": ""
            },
            "require": {
-                "php": ">=7.1"
+                "php": ">=5.6"
            },
            "require-dev": {
                "phpunit/phpunit": "^7.5",
@@ -258,9 +254,9 @@
            "homepage": "https://actionscheduler.org/",
            "support": {
                "issues": "https://github.com/woocommerce/action-scheduler/issues",
-                "source": "https://github.com/woocommerce/action-scheduler/tree/3.9.2"
+                "source": "https://github.com/woocommerce/action-scheduler/tree/3.8.0"
            },
-            "time": "2025-02-03T09:09:30+00:00"
+            "time": "2024-05-22T13:50:29+00:00"
        }
    ],
    "packages-dev": [
@@ -8343,7 +8339,7 @@
    ],
    "aliases": [],
    "minimum-stability": "dev",
-    "stability-flags": {},
+    "stability-flags": [],
    "prefer-stable": false,
    "prefer-lowest": false,
    "platform": {
--- a/mailpoet/lib/Analytics/Reporter.php
+++ b/mailpoet/lib/Analytics/Reporter.php
@@ -417,15 +417,11 @@ class Reporter {
  }

  public function getTrackingData() {
-    global $wp_version, $woocommerce; // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
    $newsletters = $this->newslettersRepository->getAnalytics();
    $segments = $this->segmentsRepository->getCountsPerType();
    $mta = $this->settings->get('mta', []);
    $installedAt = new Carbon($this->settings->get('installed_at'));
-    $theme = $this->wp->wpGetTheme();
-    $result = [
-      'WordPressVersion' => $wp_version, // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
-      'pluginGutenberg' => $this->wp->isPluginActive('gutenberg/gutenberg.php'),
+    return [
      'installedAtIso' => $installedAt->format(Carbon::ISO8601),
      'newslettersSent' => $newsletters['sent_newsletters_count'],
      'welcomeEmails' => $newsletters['welcome_newsletters_count'],
@@ -433,19 +429,9 @@ class Reporter {
      'woocommerceEmails' => $newsletters['automatic_emails_count'],
      'subscribers' => $this->subscribersFeature->getSubscribersCount(),
      'lists' => isset($segments['default']) ? (int)$segments['default'] : 0,
-      'sendingMethod' => $mta['method'] ?? null,
+      'sendingMethod' => isset($mta['method']) ? $mta['method'] : null,
      'woocommerceIsInstalled' => $this->woocommerceHelper->isWooCommerceActive(),
-      'blockTheme' => $this->wp->wpIsBlockTheme(),
-      'theme' => $theme->Name, // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
-      'themeVersion' => $theme->Version, // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
    ];
-    if (defined('GUTENBERG_VERSION')) {
-      $result['gutenbergVersion'] = GUTENBERG_VERSION;
-    }
-    if ($this->woocommerceHelper->isWooCommerceActive()) {
-      $result['wooCommerceVersion'] = $woocommerce->version;
-    }
-    return $result;
  }

  private function isFilterTypeActive(string $filterType, string $action): bool {
--- a/mailpoet/lib/Automation/Integrations/MailPoet/Actions/SendEmailAction.php
+++ b/mailpoet/lib/Automation/Integrations/MailPoet/Actions/SendEmailAction.php
@@ -62,7 +62,6 @@ class SendEmailAction implements Action {
  private const OPTIN_RETRIES = 'optin_retries';

  private const TRANSACTIONAL_TRIGGERS = [
-    'mailpoet:custom-trigger',
    'woocommerce:order-status-changed',
    'woocommerce:order-created',
    'woocommerce:order-completed',
--- a/mailpoet/lib/EmailEditor/Integrations/MailPoet/EmailEditorPreviewEmail.php
+++ b/mailpoet/lib/EmailEditor/Integrations/MailPoet/EmailEditorPreviewEmail.php
@@ -35,7 +35,7 @@ class EmailEditorPreviewEmail {
  }

  private function validateData($data) {
-    if (empty($data['email']) || empty($data['postId'])) {
+    if (empty($data['email']) || empty($data['postId']) || empty($data['newsletterId'])) {
      throw new \InvalidArgumentException(esc_html__('Missing required data', 'mailpoet'));
    }

@@ -50,9 +50,9 @@ class EmailEditorPreviewEmail {
   * @throws \Exception
   */
  private function fetchNewsletter($postData): NewsletterEntity {
-    $newsletter = $this->newslettersRepository->findOneBy(['wpPost' => (int)$postData['postId']]);
+    $newsletter = $this->newslettersRepository->findOneById((int)$postData['newsletterId']);

-    if (!$newsletter instanceof NewsletterEntity) {
+    if (!$newsletter) {
      throw new \Exception(esc_html__('This email does not exist.', 'mailpoet'));
    }

--- a/mailpoet/lib/Newsletter/Editor/PostContentManager.php
+++ b/mailpoet/lib/Newsletter/Editor/PostContentManager.php
@@ -39,13 +39,7 @@ class PostContentManager {
      if ($this->wp->hasExcerpt($post)) {
        return self::stripShortCodes($this->wp->getTheExcerpt($post));
      }
-      return self::stripShortCodes(
-        $this->wp->applyFilters(
-          'get_the_excerpt',
-          $this->generateExcerpt($post->post_content), // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
-          $post
-        )
-      );
+      return $this->generateExcerpt($post->post_content); // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
    }
    return self::stripShortCodes($post->post_content); // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
  }
--- a/mailpoet/mailpoet.php
+++ b/mailpoet/mailpoet.php
@@ -2,7 +2,7 @@

 /*
 * Plugin Name: MailPoet
- * Version: 5.7.1
+ * Version: 5.7.0
 * Plugin URI: https://www.mailpoet.com
 * Description: Create and send newsletters, post notifications and welcome emails from your WordPress.
 * Author: MailPoet
@@ -20,7 +20,7 @@
 */

 $mailpoetPlugin = [
-  'version' => '5.7.1',
+  'version' => '5.7.0',
  'filename' => __FILE__,
  'path' => dirname(__FILE__),
  'autoloader' => dirname(__FILE__) . '/vendor/autoload.php',
--- a/mailpoet/readme.txt
+++ b/mailpoet/readme.txt
@@ -3,7 +3,7 @@ Contributors: mailpoet, woocommerce, automattic
 Tags: email marketing, post notification, woocommerce emails, email automation, newsletter
 Requires at least: 6.6
 Tested up to: 6.7
-Stable tag: 5.7.1
+Stable tag: 5.7.0
 Requires PHP: 7.4
 License: GPLv3
 License URI: https://www.gnu.org/licenses/gpl-3.0.html
@@ -222,8 +222,11 @@ Check our [Knowledge Base](https://kb.mailpoet.com) or contact us through our [s

 == Changelog ==

-= 5.7.1 - 2025-02-17 =
-* Improved: Apply get_the_excerpt filter to MailPoets post excerpts;
-* Fixed: conflict with Rank Math plugin breaking "Scheduled Actions" page.
+= 5.7.0 - 2025-02-11 =
+* Improved: Rename Review Trigger in Automations;
+* Changed: minimum required WooCommerce is 9.5;
+* Fixed: Automation UI shows wrong saved status after failed activation;
+* Fixed: Email preview does not work with sent emails;
+* Fixed: email content patterns are mixed with page starter patterns.

 [See the changelog for all versions.](https://github.com/mailpoet/mailpoet/blob/trunk/mailpoet/changelog.txt)
--- a/mailpoet/tests/acceptance/EmailEditor/CreateAndSendEmailUsingGutenbergCest.php
+++ b/mailpoet/tests/acceptance/EmailEditor/CreateAndSendEmailUsingGutenbergCest.php
@@ -55,8 +55,7 @@ class CreateAndSendEmailUsingGutenbergCest {
    $i->click('Save Draft');
    $i->waitForText('Saved');
    $i->waitForText('Email saved!');
-    $i->click('[aria-label="Close sidebar"]'); // close the sidebar. It sometimes interferes with the send button click
-    $i->click('[data-automation-id="email_editor_send_button"]');
+    $i->click('Send');
    $i->waitForElement('[name="subject"]');
    $subject = $i->grabValueFrom('[name="subject"]');
    verify($subject)->equals('My New Subject');
--- a/packages/js/email-editor/README.md
+++ b/packages/js/email-editor/README.md
@@ -4,7 +4,7 @@ This folder contains the code for the MailPoet Email Editor JS Package.
 We aim to extract the package as an independent library, so it can be used in other projects.
 As we are still in an exploration phase, we keep it together with the MailPoet codebase.

-You can try the email editor in [the WordPress Playground](https://playground.wordpress.net/?blueprint-url=https://raw.githubusercontent.com/mailpoet/mailpoet/refs/heads/trunk/packages/js/email-editor/blueprint.json).
+You can try the email editor in [the WordPress Playground](https://playground.wordpress.net/?mode=seamless#%7B%22preferredVersions%22:%7B%22php%22:%228.2%22,%22wp%22:%22latest%22%7D,%22phpExtensionBundles%22:%5B%22kitchen-sink%22%5D,%22features%22:%7B%7D,%22landingPage%22:%22/wp-admin/admin.php?page=mailpoet-newsletters%22,%22steps%22:%5B%7B%22step%22:%22login%22,%22username%22:%22admin%22,%22password%22:%22password%22%7D,%7B%22step%22:%22installPlugin%22,%22pluginData%22:%7B%22resource%22:%22url%22,%22url%22:%22https://account.mailpoet.com/playground/plugin-proxy/branch:trunk%22%7D%7D,%7B%22step%22:%22mkdir%22,%22path%22:%22wordpress/wp-content/mu-plugins%22%7D,%7B%22step%22:%22writeFile%22,%22path%22:%22wordpress/wp-content/mu-plugins/addFilter-2.php%22,%22data%22:%22%3C?php%20%5Cnuse%20MailPoet%5C%5CDI%5C%5CContainerWrapper;%5Cnuse%20MailPoet%5C%5CFeatures%5C%5CFeatureFlagsRepository;%5Cnuse%20MailPoet%5C%5CFeatures%5C%5CFeaturesController;%5Cnadd_filter('mailpoet_skip_welcome_wizard',%20'__return_true');%22%7D%5D%7D).

 You can locate the PHP package here `packages/php/email-editor`

@@ -98,13 +98,11 @@ We may add, update and delete any of them.

 ### Filters

-| Name                                                            | Argument                         | Return                                     | Description                                                                                                         |
-|-----------------------------------------------------------------|----------------------------------|--------------------------------------------|---------------------------------------------------------------------------------------------------------------------|
-| `mailpoet_email_editor_events_tracking_enabled`                 | `boolean` (false-default)        | `boolean`                                  | Used to enable the email editor events tracking and collection                                                      |
-| `mailpoet_email_editor_wrap_editor_component`                   | `JSX.Element` Editor             | `JSX.Element` Editor                       | The main editor component. Custom component can wrap the editor and provide additional functionality                |
-| `mailpoet_email_editor_send_button_label`                       | `string` 'Send'                  | `string`  'Send' (default)                 | Email editor send button label. The `Send` text can be updated using this filter                                    |
-| `mailpoet_email_editor_send_action_callback`                    | `function` sendAction            | `function` sendAction                      | Action to perform when the Send button is clicked                                                                   |
-| `mailpoet_email_editor_content_validation_rules`                | `array` rules                    | `EmailContentValidationRule[]` rules       | Email editor content validation rules. The validation is done on `send btton` click and revalidated on `save draft` |
-| `mailpoet_email_editor_check_sending_method_configuration_link` | `string` link                    | `string` link                              | Edit or remove the sending configuration link message                                                               |
-| `mailpoet_email_editor_setting_sidebar_extension_component`     | `JSX.Element` RichTextWithButton | `JSX.Element` Sidebar extension component  | Add components to the Email settings sidebar                                                                        |
-| `mailpoet_email_editor_preferred_template_title`                | `string` '', `Post` post         | `string` custom (preferred) template title | Custom title for Email preset template selector                                                                     |
+| Name                                             | Argument                  | Return                               | Description                                                                                                         |
+|--------------------------------------------------|---------------------------|--------------------------------------|---------------------------------------------------------------------------------------------------------------------|
+| `mailpoet_email_editor_events_tracking_enabled`  | `boolean` (false-default) | `boolean`                            | Used to enable the email editor events tracking and collection                                                      |
+| `mailpoet_email_editor_wrap_editor_component`    | `JSX.Element` Editor      | `JSX.Element` Editor                 | The main editor component. Custom component can wrap the editor and provide additional functionality                |
+| `mailpoet_email_editor_send_button_label`        | `string` 'Send'           | `string`  'Send' (default)           | Email editor send button label. The `Send` text can be updated using this filter                                    |
+| `mailpoet_email_editor_send_action_callback`     | `function` sendAction     | `function` sendAction                | Action to perform when the Send button is clicked                                                                   |
+| `mailpoet_email_editor_content_validation_rules` | `array` rules             | `EmailContentValidationRule[]` rules | Email editor content validation rules. The validation is done on `send btton` click and revalidated on `save draft` |
+
--- a/packages/js/email-editor/blueprint.json
+++ b/packages/js/email-editor/blueprint.json
@@ -1,32 +0,0 @@
-{
-	"landingPage": "/wp-admin/admin.php?page=mailpoet-newsletters",
-	"preferredVersions": {
-		"php": "8.2",
-		"wp": "latest"
-	},
-	"features": {
-		"networking": true
-	},
-	"steps": [
-		{
-			"step": "login",
-			"username": "admin"
-		},
-		{
-			"step": "installPlugin",
-			"pluginData": {
-				"resource": "url",
-				"url": "https://account.mailpoet.com/playground/plugin-proxy/branch:trunk"
-			}
-		},
-		{
-			"step": "mkdir",
-			"path": "wordpress/wp-content/mu-plugins"
-		},
-		{
-			"step": "writeFile",
-			"path": "wordpress/wp-content/mu-plugins/addFilter-2.php",
-			"data": "<?php \nadd_filter('mailpoet_skip_welcome_wizard', '__return_true');"
-		}
-	]
-}
--- a/packages/js/email-editor/src/components/header/more-menu.tsx
+++ b/packages/js/email-editor/src/components/header/more-menu.tsx
@@ -35,7 +35,8 @@ export function MoreMenu(): JSX.Element {
 		editorCurrentPostType,
 		'status'
 	);
-	const { saveEditedEmail } = useDispatch( storeName );
+	const { saveEditedEmail, updateEmailMailPoetProperty } =
+		useDispatch( storeName );
 	const goToListings = () => {
 		window.location.href = urls.listings;
 	};
@@ -131,6 +132,10 @@ export function MoreMenu(): JSX.Element {
 								<MenuItem
 									onClick={ async () => {
 										await setStatus( 'draft' );
+										await updateEmailMailPoetProperty(
+											'deleted_at',
+											''
+										);
 										await saveEditedEmail();
 										recordEvent(
 											'header_more_menu_restore_from_trash_button_clicked'
--- a/packages/js/email-editor/src/components/header/send-button.tsx
+++ b/packages/js/email-editor/src/components/header/send-button.tsx
@@ -63,7 +63,6 @@ export function SendButton( { validateContent, isContentInvalid } ) {
 				}
 			} }
 			disabled={ isDisabled }
-			data-automation-id="email_editor_send_button"
 		>
 			{ label }
 		</Button>
--- a/packages/js/email-editor/src/components/personalization-tags/rich-text-utils.ts
+++ b/packages/js/email-editor/src/components/personalization-tags/rich-text-utils.ts
@@ -18,7 +18,7 @@ type Replacement = {
 function getChildElement( rootElement: HTMLElement ): HTMLElement | null {
 	let currentElement: HTMLElement | null = rootElement;

-	while ( currentElement && currentElement?.children?.length > 0 ) {
+	while ( currentElement && currentElement.children.length > 0 ) {
 		// Traverse into the first child element
 		currentElement = currentElement.children[ 0 ] as HTMLElement;
 	}
--- a/packages/js/email-editor/src/components/personalization-tags/rich-text-with-button.tsx
+++ b/packages/js/email-editor/src/components/personalization-tags/rich-text-with-button.tsx
@@ -1,10 +1,10 @@
 /**
 * External dependencies
 */
-import type { ReactNode } from 'react';
 import { BaseControl, Button } from '@wordpress/components';
-import { useSelect } from '@wordpress/data';
+import { useDispatch, useSelect } from '@wordpress/data';
 import { useCallback, useRef, useState } from '@wordpress/element';
+import { useEntityProp } from '@wordpress/core-data';
 import { create, insert, toHTMLString } from '@wordpress/rich-text';
 import { RichText } from '@wordpress/block-editor';
 import { __ } from '@wordpress/i18n';
@@ -17,32 +17,25 @@ import {
 	getCursorPosition,
 	replacePersonalizationTagsWithHTMLComments,
 } from './rich-text-utils';
-import { storeName } from '../../store';
+import { storeName, editorCurrentPostType } from '../../store';
 import { PersonalizationTagsPopover } from './personalization-tags-popover';
 import { recordEvent, recordEventOnce } from '../../events';

-type Props = {
-	label: string;
-	labelSuffix?: ReactNode;
-	help?: ReactNode;
-	placeholder: string;
-	attributeName: string;
-	attributeValue?: string;
-	updateProperty: (
-		theAttributeName: string,
-		theUpdatedValue: string
-	) => void;
-};
-
 export function RichTextWithButton( {
 	label,
 	labelSuffix,
 	help,
 	placeholder,
 	attributeName,
-	attributeValue,
-	updateProperty = () => {},
-}: Props ) {
+} ) {
+	const [ mailpoetEmailData ] = useEntityProp(
+		'postType',
+		editorCurrentPostType,
+		'mailpoet_data'
+	);
+
+	const { updateEmailMailPoetProperty } = useDispatch( storeName );
+
 	const [ selectionRange, setSelectionRange ] = useState( null );
 	const [ isModalOpened, setIsModalOpened ] = useState( false );
 	const list = useSelect(
@@ -68,11 +61,11 @@ export function RichTextWithButton( {
 			const updatedValue = toHTMLString( { value: richTextValue } );

 			// Update the corresponding property
-			updateProperty( attributeName, updatedValue );
+			updateEmailMailPoetProperty( attributeName, updatedValue );

 			setSelectionRange( null );
 		},
-		[ attributeName, updateProperty ]
+		[ attributeName, updateEmailMailPoetProperty ]
 	);

 	const finalLabel = (
@@ -97,13 +90,13 @@ export function RichTextWithButton( {
 		</>
 	);

-	if ( ! attributeName ) {
+	if ( ! mailpoetEmailData ) {
 		return null;
 	}

 	return (
 		<BaseControl
-			id="" // See https://github.com/mailpoet/mailpoet/pull/6089#discussion_r1952126850 to understand why the ID is empty
+			id={ `mailpoet-settings-panel__${ attributeName }` }
 			label={ finalLabel }
 			className={ `mailpoet-settings-panel__${ attributeName }-text` }
 			help={ help }
@@ -114,7 +107,7 @@ export function RichTextWithButton( {
 				onInsert={ ( value ) => {
 					handleInsertPersonalizationTag(
 						value,
-						attributeValue ?? '',
+						mailpoetEmailData[ attributeName ] ?? '',
 						selectionRange
 					);
 					setIsModalOpened( false );
@@ -132,13 +125,17 @@ export function RichTextWithButton( {
 			<PersonalizationTagsPopover
 				contentRef={ richTextRef }
 				onUpdate={ ( originalTag, updatedTag ) => {
-					const currentValue = attributeValue ?? '';
+					const currentValue =
+						mailpoetEmailData[ attributeName ] ?? '';
 					// When we update the tag, we need to add brackets to the tag, because the popover removes them
 					const updatedContent = currentValue.replace(
 						`<!--[${ originalTag }]-->`,
 						`<!--[${ updatedTag }]-->`
 					);
-					updateProperty( attributeName, updatedContent );
+					updateEmailMailPoetProperty(
+						attributeName,
+						updatedContent
+					);
 				} }
 			/>
 			<RichText
@@ -147,17 +144,26 @@ export function RichTextWithButton( {
 				placeholder={ placeholder }
 				onFocus={ () => {
 					setSelectionRange(
-						getCursorPosition( richTextRef, attributeValue ?? '' )
+						getCursorPosition(
+							richTextRef,
+							mailpoetEmailData[ attributeName ] ?? ''
+						)
 					);
 				} }
 				onKeyUp={ () => {
 					setSelectionRange(
-						getCursorPosition( richTextRef, attributeValue ?? '' )
+						getCursorPosition(
+							richTextRef,
+							mailpoetEmailData[ attributeName ] ?? ''
+						)
 					);
 				} }
 				onClick={ () => {
 					setSelectionRange(
-						getCursorPosition( richTextRef, attributeValue ?? '' )
+						getCursorPosition(
+							richTextRef,
+							mailpoetEmailData[ attributeName ] ?? ''
+						)
 					);
 				} }
 				onChange={ ( value ) => {
@@ -165,7 +171,7 @@ export function RichTextWithButton( {
 						value ?? '',
 						list
 					);
-					updateProperty( attributeName, value );
+					updateEmailMailPoetProperty( attributeName, value );
 					recordEventOnce(
 						'rich_text_with_button_input_field_updated',
 						{
@@ -173,7 +179,7 @@ export function RichTextWithButton( {
 						}
 					);
 				} }
-				value={ attributeValue ?? '' }
+				value={ mailpoetEmailData[ attributeName ] ?? '' }
 				data-automation-id={ `email_${ attributeName }` }
 			/>
 		</BaseControl>
--- a/packages/js/email-editor/src/components/preview/send-preview-email.tsx
+++ b/packages/js/email-editor/src/components/preview/send-preview-email.tsx
@@ -4,7 +4,7 @@
 import { Button, Modal, TextControl } from '@wordpress/components';
 import { useDispatch, useSelect } from '@wordpress/data';
 import { check, Icon } from '@wordpress/icons';
-import { __, sprintf } from '@wordpress/i18n';
+import { __ } from '@wordpress/i18n';
 import {
 	useEffect,
 	useRef,
@@ -13,23 +13,19 @@ import {
 } from '@wordpress/element';
 import { ENTER } from '@wordpress/keycodes';
 import { isEmail } from '@wordpress/url';
-import { applyFilters } from '@wordpress/hooks';
+import { useEntityProp } from '@wordpress/core-data';

 /**
 * Internal dependencies
 */
 import {
+	MailPoetEmailData,
 	SendingPreviewStatus,
 	storeName,
 	editorCurrentPostType,
 } from '../../store';
 import { recordEvent, recordEventOnce } from '../../events';

-const sendingMethodConfigurationLink = applyFilters(
-	'mailpoet_email_editor_check_sending_method_configuration_link',
-	'admin.php?page=mailpoet-settings#mta'
-) as string;
-
 function RawSendPreviewEmail() {
 	const sendToRef = useRef( null );

@@ -44,11 +40,19 @@ function RawSendPreviewEmail() {
 		isSendingPreviewEmail,
 		sendingPreviewStatus,
 		isModalOpened,
-		errorMessage,
 	} = useSelect( ( select ) => select( storeName ).getPreviewState(), [] );

+	const [ mailpoetEmailData ] = useEntityProp(
+		'postType',
+		editorCurrentPostType,
+		'mailpoet_data'
+	) as [ MailPoetEmailData, unknown, unknown ];
+
 	const handleSendPreviewEmail = () => {
-		void requestSendingNewsletterPreview( previewToEmail );
+		void requestSendingNewsletterPreview(
+			mailpoetEmailData.id,
+			previewToEmail
+		);
 	};

 	const closeCallback = () => {
@@ -77,48 +81,33 @@ function RawSendPreviewEmail() {
 		>
 			{ sendingPreviewStatus === SendingPreviewStatus.ERROR ? (
 				<div className="mailpoet-send-preview-modal-notice-error">
-					<p>
-						{ __(
-							'Sorry, we were unable to send this email.',
-							'mailpoet'
-						) }
-					</p>
-
-					<strong>
-						{ errorMessage &&
-							sprintf(
-								// translators: %s is an error message.
-								__( 'Error: %s', 'mailpoet' ),
-								errorMessage
-							) }
-					</strong>
-
+					{ __(
+						'Sorry, we were unable to send this email.',
+						'mailpoet'
+					) }
 					<ul>
 						<li>
-							{ sendingMethodConfigurationLink &&
-								createInterpolateElement(
-									__(
-										'Please check your <link>sending method configuration</link> with your hosting provider.',
-										'mailpoet'
+							{ createInterpolateElement(
+								__(
+									'Please check your <link>sending method configuration</link> with your hosting provider.',
+									'mailpoet'
+								),
+								{
+									link: (
+										// eslint-disable-next-line jsx-a11y/anchor-has-content, jsx-a11y/control-has-associated-label
+										<a
+											href="admin.php?page=mailpoet-settings#mta"
+											target="_blank"
+											rel="noopener noreferrer"
+											onClick={ () =>
+												recordEvent(
+													'send_preview_email_modal_check_sending_method_configuration_link_clicked'
+												)
+											}
+										/>
 									),
-									{
-										link: (
-											// eslint-disable-next-line jsx-a11y/anchor-has-content, jsx-a11y/control-has-associated-label
-											<a
-												href={
-													sendingMethodConfigurationLink
-												}
-												target="_blank"
-												rel="noopener noreferrer"
-												onClick={ () =>
-													recordEvent(
-														'send_preview_email_modal_check_sending_method_configuration_link_clicked'
-													)
-												}
-											/>
-										),
-									}
-								) }
+								}
+							) }
 						</li>
 						<li>
 							{ createInterpolateElement(
@@ -130,7 +119,10 @@ function RawSendPreviewEmail() {
 									link: (
 										// eslint-disable-next-line jsx-a11y/anchor-has-content, jsx-a11y/control-has-associated-label
 										<a
-											href={ `https://account.mailpoet.com/?s=1&g=1&utm_source=mailpoet_email_editor&utm_medium=plugin&utm_source_platform=${ editorCurrentPostType }` }
+											href={ new URL(
+												'free-plan',
+												'https://www.mailpoet.com/'
+											).toString() }
 											key="sign-up-for-free"
 											target="_blank"
 											rel="noopener noreferrer"
--- a/packages/js/email-editor/src/components/sidebar/details-panel.tsx
+++ b/packages/js/email-editor/src/components/sidebar/details-panel.tsx
@@ -1,22 +1,92 @@
 /**
 * External dependencies
 */
-import { PanelBody } from '@wordpress/components';
+import { ExternalLink, PanelBody } from '@wordpress/components';
+import { useEntityProp } from '@wordpress/core-data';
 import { __ } from '@wordpress/i18n';
-import { applyFilters } from '@wordpress/hooks';
+import { createInterpolateElement } from '@wordpress/element';
+import classnames from 'classnames';

 /**
 * Internal dependencies
 */
+import { editorCurrentPostType } from '../../store';
 import { recordEvent } from '../../events';
 import { RichTextWithButton } from '../personalization-tags/rich-text-with-button';

-const SidebarExtensionComponent = applyFilters(
-	'mailpoet_email_editor_setting_sidebar_extension_component',
-	RichTextWithButton
-) as () => JSX.Element;
+const previewTextMaxLength = 150;
+const previewTextRecommendedLength = 80;

 export function DetailsPanel() {
+	const [ mailpoetEmailData ] = useEntityProp(
+		'postType',
+		editorCurrentPostType,
+		'mailpoet_data'
+	);
+
+	const subjectHelp = createInterpolateElement(
+		__(
+			'Use personalization tags to personalize your email, or learn more about <bestPracticeLink>best practices</bestPracticeLink> and using <emojiLink>emoji in subject lines</emojiLink>.',
+			'mailpoet'
+		),
+		{
+			bestPracticeLink: (
+				// eslint-disable-next-line jsx-a11y/anchor-has-content, jsx-a11y/control-has-associated-label
+				<a
+					href="https://www.mailpoet.com/blog/17-email-subject-line-best-practices-to-boost-engagement/"
+					target="_blank"
+					rel="noopener noreferrer"
+					onClick={ () =>
+						recordEvent(
+							'details_panel_subject_help_best_practice_link_clicked'
+						)
+					}
+				/>
+			),
+			emojiLink: (
+				// eslint-disable-next-line jsx-a11y/anchor-has-content, jsx-a11y/control-has-associated-label
+				<a
+					href="https://www.mailpoet.com/blog/tips-using-emojis-in-subject-lines/"
+					target="_blank"
+					rel="noopener noreferrer"
+					onClick={ () =>
+						recordEvent(
+							'details_panel_subject_help_emoji_in_subject_lines_link_clicked'
+						)
+					}
+				/>
+			),
+		}
+	);
+
+	const previewTextLength = mailpoetEmailData?.preheader?.length ?? 0;
+
+	const preheaderHelp = createInterpolateElement(
+		__(
+			'<link>This text</link> will appear in the inbox, underneath the subject line.',
+			'mailpoet'
+		),
+		{
+			link: (
+				// eslint-disable-next-line jsx-a11y/anchor-has-content, jsx-a11y/control-has-associated-label
+				<a
+					href={ new URL(
+						'article/418-preview-text',
+						'https://kb.mailpoet.com/'
+					).toString() }
+					key="preview-text-kb"
+					target="_blank"
+					rel="noopener noreferrer"
+					onClick={ () =>
+						recordEvent(
+							'details_panel_preheader_help_text_link_clicked'
+						)
+					}
+				/>
+			),
+		}
+	);
+
 	return (
 		<PanelBody
 			title={ __( 'Details', 'mailpoet' ) }
@@ -25,7 +95,50 @@ export function DetailsPanel() {
 				recordEvent( 'details_panel_body_toggle', { opened: data } )
 			}
 		>
-			<>{ <SidebarExtensionComponent /> }</>
+			<RichTextWithButton
+				attributeName="subject"
+				label={ __( 'Subject', 'mailpoet' ) }
+				labelSuffix={
+					<ExternalLink
+						href="https://kb.mailpoet.com/article/435-a-guide-to-personalisation-tags-for-tailored-newsletters#list"
+						onClick={ () =>
+							recordEvent(
+								'details_panel_personalisation_tags_guide_link_clicked'
+							)
+						}
+					>
+						{ __( 'Guide', 'mailpoet' ) }
+					</ExternalLink>
+				}
+				help={ subjectHelp }
+				placeholder={ __( 'Eg. The summer sale is here!', 'mailpoet' ) }
+			/>
+
+			<RichTextWithButton
+				attributeName="preheader"
+				label={ __( 'Preview text', 'mailpoet' ) }
+				labelSuffix={
+					<span
+						className={ classnames(
+							'mailpoet-settings-panel__preview-text-length',
+							{
+								'mailpoet-settings-panel__preview-text-length-warning':
+									previewTextLength >
+									previewTextRecommendedLength,
+								'mailpoet-settings-panel__preview-text-length-error':
+									previewTextLength > previewTextMaxLength,
+							}
+						) }
+					>
+						{ previewTextLength }/{ previewTextMaxLength }
+					</span>
+				}
+				help={ preheaderHelp }
+				placeholder={ __(
+					"Add a preview text to capture subscribers' attention and increase open rates.",
+					'mailpoet'
+				) }
+			/>
 		</PanelBody>
 	);
 }
--- a/packages/js/email-editor/src/hooks/use-preview-templates.ts
+++ b/packages/js/email-editor/src/hooks/use-preview-templates.ts
@@ -5,7 +5,6 @@ import { useMemo } from '@wordpress/element';
 import { parse } from '@wordpress/blocks';
 import { BlockInstance } from '@wordpress/blocks/index';
 import { useSelect } from '@wordpress/data';
-import { applyFilters } from '@wordpress/hooks';

 /**
 * Internal dependencies
@@ -164,11 +163,6 @@ export function usePreviewTemplates(

 	const allEmailPosts = useMemo( () => {
 		return emailPosts?.map( ( post: EmailEditorPostType ) => {
-			const preferredTitle = applyFilters(
-				'mailpoet_email_editor_preferred_template_title',
-				'',
-				post
-			);
 			const { postTemplateContent } = generateTemplateContent(
 				post,
 				allTemplates
@@ -186,8 +180,9 @@ export function usePreviewTemplates(
 			const template = {
 				...post,
 				title: {
-					raw: post.title.raw,
-					rendered: preferredTitle || post.title.rendered,
+					raw: post?.mailpoet_data?.subject || post.title.raw,
+					rendered:
+						post?.mailpoet_data?.subject || post.title.rendered, // use MailPoet subject as title
 				},
 			};
 			return {
--- a/packages/js/email-editor/src/store/actions.ts
+++ b/packages/js/email-editor/src/store/actions.ts
@@ -134,6 +134,29 @@ export function* saveEditedEmail() {
 	} );
 }

+export function* updateEmailMailPoetProperty( name: string, value: string ) {
+	const postId = select( storeName ).getEmailPostId();
+	// There can be a better way how to get the edited post data
+	const editedPost = select( coreDataStore ).getEditedEntityRecord(
+		'postType',
+		editorCurrentPostType,
+		postId
+	);
+	// @ts-expect-error Property 'mailpoet_data' does not exist on type 'Updatable<Attachment<any>>'.
+	const mailpoetData = editedPost?.mailpoet_data || {};
+	yield dispatch( coreDataStore ).editEntityRecord(
+		'postType',
+		editorCurrentPostType,
+		postId,
+		{
+			mailpoet_data: {
+				...mailpoetData,
+				[ name ]: value,
+			},
+		}
+	);
+}
+
 export const setTemplateToPost =
 	( templateSlug ) =>
 	async ( { registry } ) => {
@@ -145,7 +168,10 @@ export const setTemplateToPost =
 			} );
 	};

-export function* requestSendingNewsletterPreview( email: string ) {
+export function* requestSendingNewsletterPreview(
+	newsletterId: number,
+	email: string
+) {
 	// If preview is already sending do nothing
 	const previewState = select( storeName ).getPreviewState();
 	if ( previewState.isSendingPreviewEmail ) {
@@ -166,6 +192,7 @@ export function* requestSendingNewsletterPreview( email: string ) {
 			path: '/mailpoet-email-editor/v1/send_preview_email',
 			method: 'POST',
 			data: {
+				newsletterId,
 				email,
 				postId,
 			},
@@ -186,9 +213,6 @@ export function* requestSendingNewsletterPreview( email: string ) {
 			state: {
 				sendingPreviewStatus: SendingPreviewStatus.ERROR,
 				isSendingPreviewEmail: false,
-				// eslint-disable-next-line @typescript-eslint/ban-ts-comment
-				// @ts-ignore
-				errorMessage: JSON.stringify( errorResponse?.error ),
 			},
 		};
 	}
--- a/packages/js/email-editor/src/store/selectors.ts
+++ b/packages/js/email-editor/src/store/selectors.ts
@@ -96,8 +96,13 @@ export const isEmpty = createRegistrySelector( ( select ) => (): boolean => {
 		return true;
 	}

-	const { content, title } = post;
-	return ! content.raw && ! title.raw;
+	const { content, mailpoet_data: mailpoetData, title } = post;
+	return (
+		! content.raw &&
+		! mailpoetData.subject &&
+		! mailpoetData.preheader &&
+		! title.raw
+	);
 } );

 export const hasEmptyContent = createRegistrySelector(
--- a/packages/js/email-editor/src/store/types.ts
+++ b/packages/js/email-editor/src/store/types.ts
@@ -202,7 +202,6 @@ export type State = {
 		isModalOpened: boolean;
 		isSendingPreviewEmail: boolean;
 		sendingPreviewStatus: SendingPreviewStatus | null;
-		errorMessage?: string;
 	};
 	personalizationTags: {
 		list: PersonalizationTag[];
@@ -210,6 +209,13 @@ export type State = {
 	};
 };

+export type MailPoetEmailData = {
+	id: number;
+	subject: string;
+	preheader: string;
+	preview_url: string;
+};
+
 export type EmailTemplate = {
 	id: string;
 	slug: string;
@@ -261,6 +267,7 @@ export type MailPoetEmailPostContentExtended = {

 export type EmailEditorPostType = Omit< Post, 'type' > & {
 	type: string;
+	mailpoet_data?: MailPoetEmailPostContentExtended;
 };

 export type EmailContentValidationAction = {
--- a/packages/php/email-editor/README.md
+++ b/packages/php/email-editor/README.md
@@ -75,3 +75,5 @@ We may add, update and delete any of them.
 | `mailpoet_email_editor_send_preview_email`    | `Array` $postData                         | `boolean` Result of processing. Was email sent successfully? | Allows override of the send preview mail function. Folks may choose to use custom implementation                                                                    |
 | `mailpoet_email_editor_post_sent_status_args` | `Array` `sent` post status args           | `Array` register_post_status args                            | Allows update of the argument for the sent post status                                                                                                              |

+## TODO
+- We use `mailpoet_data` in some section of the codebase. This will be updated.
--- a/packages/php/email-editor/composer.json
+++ b/packages/php/email-editor/composer.json
@@ -5,7 +5,10 @@
  "autoload": {
    "classmap": [
      "src/"
-    ]
+    ],
+		"files": [
+			"src/exceptions.php"
+		]
  },
  "autoload-dev": {
    "classmap": [
@@ -26,7 +29,7 @@
    "unit-test": "../../../tests_env/vendor/bin/codecept run unit",
    "integration-test": "cd ../../../tests_env/docker && COMPOSE_HTTP_TIMEOUT=200 docker compose run -e SKIP_DEPS=1 -e SKIP_PLUGINS=1 -e PACKAGE_NAME=email-editor codeception_integration",
    "code-style": "../../../mailpoet/tasks/code_sniffer/vendor/bin/phpcs -ps",
-    "code-style-fix": "../../../mailpoet/tasks/code_sniffer/vendor/bin/phpcbf -p",
-    "phpstan": "php ./tasks/run-phpstan.php"
+		"code-style-fix": "../../../mailpoet/tasks/code_sniffer/vendor/bin/phpcbf -p",
+		"phpstan": "php ./tasks/run-phpstan.php"
  }
 }
--- a/packages/php/email-editor/src/Engine/class-email-api-controller.php
+++ b/packages/php/email-editor/src/Engine/class-email-api-controller.php
@@ -66,6 +66,7 @@ class Email_Api_Controller {
 		 * $data - Post Data
 		 * format
 		 * [_locale] => user
+		 * [newsletterId] => NEWSLETTER_ID
 		 * [email] => Provided email address
 		 * [postId] => POST_ID
 		 */