diff --git a/src/Entity/User.php b/src/Entity/User.php
index a6dcbbb7a056d216475c2232caa494b22da7270c..16a7bec5c2d6551c731aa6706994b983d07f1077 100644
--- a/src/Entity/User.php
+++ b/src/Entity/User.php
@@ -8,6 +8,7 @@ use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Component\Security\Core\User\LegacyPasswordAuthenticatedUserInterface;
 use Symfony\Component\Security\Core\User\PasswordAuthenticatedUserInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Validator\Constraints as Assert;
 
 /**
  * @ORM\Entity(repositoryClass=UserRepository::class)
@@ -25,6 +26,7 @@ class User implements UserInterface, LegacyPasswordAuthenticatedUserInterface
 
     /**
      * @ORM\Column(type="string", length=255)
+     * @Assert\Email(message = "The email {{ value }} is not a valid email.")
      */
     private $email;
 
diff --git a/tests/functional/RegistrationControllerTest.php b/tests/functional/RegistrationControllerTest.php
index 9cb13bb7479d49a20226d1fef08c02f019265424..a3cf7cc1edb2d6da54e3626ed2ef891fdbdf9367 100644
--- a/tests/functional/RegistrationControllerTest.php
+++ b/tests/functional/RegistrationControllerTest.php
@@ -18,7 +18,6 @@ class RegistrationControllerTest extends WebTestCase
 
         $this->registerUser($userEmail, $client);
 
-
         $this->assertUserIsRedirectedToTheEmailNotificationPage($client);
     }
 
@@ -101,6 +100,17 @@ class RegistrationControllerTest extends WebTestCase
         $this->assertResponseRedirects('/my_capsules', 302);
     }
 
+    public function testSubmittingTheRegisterFormWithAnInvalidEmailAddressShouldDisplayAFeedbackError(): void
+    {
+        $userEmail =  'invalidEmailAddress';
+        $client = static::createClient();
+
+        $crawler = $this->registerUser($userEmail, $client);
+        $html = $crawler->outerHtml();
+
+        $this->assertStringContainsString("is not a valid email", $html);
+    }
+
     /**
      * @param string $userEmail The registered user email
      * @return RawMessage The email message sent to the user
@@ -136,7 +146,7 @@ class RegistrationControllerTest extends WebTestCase
         $this->assertResponseIsSuccessful('/register_mail_sent');
     }
 
-    private function registerUser(string $userEmail, KernelBrowser &$client): void
+    private function registerUser(string $userEmail, KernelBrowser &$client): ?Crawler
     {
         $crawler = $client->request('GET', '/register');
 
@@ -147,7 +157,6 @@ class RegistrationControllerTest extends WebTestCase
         $submit = $crawler->selectButton('Register');
         $form = $submit->form();
 
-
         $form['registration_form[firstName]'] = 'new User FirstName';
         $form['registration_form[lastName]'] = 'new User LastName';
         $form['registration_form[email]'] = $userEmail;
@@ -155,7 +164,7 @@ class RegistrationControllerTest extends WebTestCase
         $form['registration_form[plainPassword][second]'] = 'password';
         $form['registration_form[agreeTerms]'] = 1;
 
-        $client->submit($form);
+        return $client->submit($form);
     }
 
     private function clickOnEmailMessageLink(RawMessage $emailMessage, KernelBrowser $client): void