diff --git a/app/code/Magento/Newsletter/Controller/Subscriber/NewAction.php b/app/code/Magento/Newsletter/Controller/Subscriber/NewAction.php
index c776ca65407bf..4f46c84894f12 100644
--- a/app/code/Magento/Newsletter/Controller/Subscriber/NewAction.php
+++ b/app/code/Magento/Newsletter/Controller/Subscriber/NewAction.php
@@ -80,8 +80,9 @@ public function __construct(
     protected function validateEmailAvailable($email)
     {
         $websiteId = $this->_storeManager->getStore()->getWebsiteId();
-        if ($this->_customerSession->getCustomerDataObject()->getEmail() !== $email
-            && !$this->customerAccountManagement->isEmailAvailable($email, $websiteId)
+        if ($this->_customerSession->isLoggedIn()
+            && ($this->_customerSession->getCustomerDataObject()->getEmail() !== $email
+            && !$this->customerAccountManagement->isEmailAvailable($email, $websiteId))
         ) {
             throw new LocalizedException(
                 __('This email address is already assigned to another user.')
diff --git a/dev/tests/integration/testsuite/Magento/Newsletter/Controller/SubscriberTest.php b/dev/tests/integration/testsuite/Magento/Newsletter/Controller/SubscriberTest.php
index 92e4f31064e43..9dbf5c4d2a2a9 100644
--- a/dev/tests/integration/testsuite/Magento/Newsletter/Controller/SubscriberTest.php
+++ b/dev/tests/integration/testsuite/Magento/Newsletter/Controller/SubscriberTest.php
@@ -57,7 +57,7 @@ public function testNewActionUsedEmail()
         $this->dispatch('newsletter/subscriber/new');
 
         $this->assertSessionMessages($this->equalTo([
-                'This email address is already assigned to another user.',
+                'Thank you for your subscription.',
             ]));
         $this->assertRedirect($this->anything());
     }