diff --git a/lib/API/JSON/v1/Settings.php b/lib/API/JSON/v1/Settings.php
index 09980c1f48..5dc0e4a6c6 100644
--- a/lib/API/JSON/v1/Settings.php
+++ b/lib/API/JSON/v1/Settings.php
@@ -126,7 +126,7 @@ class Settings extends APIEndpoint {
         $this->bridge->onSettingsSave($settings);
       }
 
-      $this->authorizedEmailsController->onSettingsSave($settings);
+      $meta = $this->authorizedEmailsController->onSettingsSave($settings);
       if ($signupConfirmation !== $this->settings->get('signup_confirmation.enabled')) {
         $this->messageController->updateSuccessMessages();
       }
diff --git a/lib/Services/AuthorizedEmailsController.php b/lib/Services/AuthorizedEmailsController.php
index 7bc071e1e2..fc49477b77 100644
--- a/lib/Services/AuthorizedEmailsController.php
+++ b/lib/Services/AuthorizedEmailsController.php
@@ -62,13 +62,13 @@ class AuthorizedEmailsController {
     if (!Bridge::isMPSendingServiceEnabled()) {
       $this->settings->set(self::AUTHORIZED_EMAIL_ADDRESSES_ERROR_SETTING, null);
       $this->updateMailerLog();
-      return;
+      return null;
     }
 
     $authorizedEmails = $this->bridge->getAuthorizedEmailAddresses();
     // Keep previous check result for an invalid response from API
     if ($authorizedEmails === false) {
-      return;
+      return null;
     }
     $authorizedEmails = array_map('strtolower', $authorizedEmails);
 
@@ -77,14 +77,16 @@ class AuthorizedEmailsController {
     $result = $this->validateAddressesInScheduledAndAutomaticEmails($authorizedEmails, $result);
     $this->settings->set(self::AUTHORIZED_EMAIL_ADDRESSES_ERROR_SETTING, $result ?: null);
     $this->updateMailerLog($result);
+    return $result;
   }
 
-  public function onSettingsSave($settings) {
+  public function onSettingsSave($settings): ?array {
     $senderAddressSet = !empty($settings['sender']['address']);
     $mailpoetSendingMethodSet = ($settings[Mailer::MAILER_CONFIG_SETTING_NAME]['method'] ?? null) === Mailer::METHOD_MAILPOET;
     if ($senderAddressSet || $mailpoetSendingMethodSet) {
-      $this->checkAuthorizedEmailAddresses();
+      return $this->checkAuthorizedEmailAddresses();
     }
+    return null;
   }
 
   public function onNewsletterSenderAddressUpdate(NewsletterEntity $newsletter, string $oldSenderAddress = null) {
diff --git a/tests/integration/API/JSON/v1/SettingsTest.php b/tests/integration/API/JSON/v1/SettingsTest.php
index a0da4d5ec8..717302a250 100644
--- a/tests/integration/API/JSON/v1/SettingsTest.php
+++ b/tests/integration/API/JSON/v1/SettingsTest.php
@@ -13,6 +13,7 @@ use MailPoet\Cron\Workers\WooCommerceSync;
 use MailPoet\Entities\NewsletterEntity;
 use MailPoet\Entities\ScheduledTaskEntity;
 use MailPoet\Form\FormMessageController;
+use MailPoet\Mailer\Mailer;
 use MailPoet\Mailer\MailerLog;
 use MailPoet\Models\ScheduledTask;
 use MailPoet\Newsletter\NewslettersRepository;
@@ -54,7 +55,7 @@ class SettingsTest extends \MailPoetTest {
     $this->endpoint = new Settings(
       $this->settings,
       new Bridge,
-      $this->make(AuthorizedEmailsController::class, ['onSettingsSave' => true ]),
+      $this->make(AuthorizedEmailsController::class, ['onSettingsSave' => null ]),
       $this->make(TransactionalEmails::class),
       WPFunctions::get(),
       $this->diContainer->get(EntityManager::class),
@@ -148,6 +149,36 @@ class SettingsTest extends \MailPoetTest {
     expect(MailerLog::isSendingPaused())->false();
   }
 
+  public function testItSaveUnauthorizedAddressAndReturnsMeta() {
+    $this->settings->set(Mailer::MAILER_CONFIG_SETTING_NAME, ['method' => Mailer::METHOD_MAILPOET]);
+    $bridgeMock = $this->make(Bridge::class, ['getAuthorizedEmailAddresses' => Expected::once(['authorized@email.com'])]);
+    $this->endpoint = new Settings(
+      $this->settings,
+      $bridgeMock,
+      new AuthorizedEmailsController($this->settings, $bridgeMock, $this->diContainer->get(NewslettersRepository::class)),
+      $this->make(TransactionalEmails::class),
+      WPFunctions::get(),
+      $this->diContainer->get(EntityManager::class),
+      $this->diContainer->get(NewslettersRepository::class),
+      $this->diContainer->get(StatisticsOpensRepository::class),
+      $this->diContainer->get(ScheduledTasksRepository::class),
+      $this->diContainer->get(FormMessageController::class),
+      $this->make(ServicesChecker::class, ['isMailPoetAPIKeyPendingApproval' => false]),
+      $this->diContainer->get(SegmentsRepository::class),
+      $this->diContainer->get(SubscribersCountsController::class)
+    );
+
+    $response = $this->endpoint->set([
+      'sender' => ['address' => 'invalid@email.com'],
+    ]);
+    expect($response->status)->same(200);
+    expect($this->settings->get('sender.address'))->same('invalid@email.com');
+    expect($response->meta)->equals([
+      'invalid_sender_address' => 'invalid@email.com',
+      'showNotice' => false,
+    ]);
+  }
+
   public function testItRejectsUnauthorizedFromAddress() {
     $bridgeMock = $this->make(Bridge::class, ['getAuthorizedEmailAddresses' => Expected::once(['authorized@email.com'])]);
     $this->endpoint = new Settings(