diff --git a/app/Http/Controllers/Auth/RegisteredUserController.php b/app/Http/Controllers/Auth/RegisteredUserController.php
index 52848a7ac..3eb360b1a 100644
--- a/app/Http/Controllers/Auth/RegisteredUserController.php
+++ b/app/Http/Controllers/Auth/RegisteredUserController.php
@@ -37,7 +37,7 @@ public function store(Request $request): RedirectResponse
         $request->validate([
             'name' => ['required', 'string', 'max:255'],
             'username' => ['required', 'string', 'min:4', 'max:50', 'unique:'.User::class, new Username],
-            'email' => ['required', 'string', 'lowercase', 'email', 'max:255', 'unique:'.User::class, new UnauthorizedEmailProviders()],
+            'email' => ['required', 'string', 'lowercase', 'email:rfc,dns', 'max:255', 'unique:'.User::class, new UnauthorizedEmailProviders()],
             'password' => ['required', 'confirmed', Rules\Password::defaults()],
             'terms' => ['required', 'accepted'],
             'g-recaptcha-response' => app()->environment('production') ? ['required', new Recaptcha($request->ip())] : [],
diff --git a/app/Http/Requests/UserUpdateRequest.php b/app/Http/Requests/UserUpdateRequest.php
index efb795f96..6e7fa6b35 100644
--- a/app/Http/Requests/UserUpdateRequest.php
+++ b/app/Http/Requests/UserUpdateRequest.php
@@ -33,7 +33,7 @@ public function rules(): array
                 new Username($user),
             ],
             'email' => [
-                'required', 'string', 'lowercase', 'email', 'max:255', Rule::unique(User::class)->ignore($user->id),
+                'required', 'string', 'lowercase', 'email:rfc,dns', 'max:255', Rule::unique(User::class)->ignore($user->id),
                 new UnauthorizedEmailProviders(),
             ],
             'mail_preference_time' => [Rule::enum(UserMailPreference::class)],
diff --git a/composer.json b/composer.json
index cd69982f5..b0dad8d03 100644
--- a/composer.json
+++ b/composer.json
@@ -3,6 +3,7 @@
     "type": "project",
     "require": {
         "php": "^8.3",
+        "ext-intl": "*",
         "filament/filament": "^3.2.115",
         "intervention/image": "^3.8.0",
         "laravel/fortify": "^1.21.1",
diff --git a/database/factories/UserFactory.php b/database/factories/UserFactory.php
index fdd944edf..1730e9826 100644
--- a/database/factories/UserFactory.php
+++ b/database/factories/UserFactory.php
@@ -42,7 +42,7 @@ public function definition(): array
         return [
             'name' => fake()->name(),
             'username' => fake()->unique()->userName(),
-            'email' => fake()->unique()->safeEmail(),
+            'email' => fake()->unique()->freeEmail(),
             'email_verified_at' => now(),
             'password' => self::$password ??= Hash::make('password'),
             'remember_token' => Str::random(10),
diff --git a/tests/Http/Profile/EditTest.php b/tests/Http/Profile/EditTest.php
index 605777452..6a2766c09 100644
--- a/tests/Http/Profile/EditTest.php
+++ b/tests/Http/Profile/EditTest.php
@@ -31,13 +31,14 @@
 
 test('profile information can be updated', function () {
     $user = User::factory()->create();
+    $freeEmail = fake()->unique()->freeEmail();
 
     $response = $this
         ->actingAs($user)
         ->patch('/profile', [
             'name' => 'Test User',
             'username' => 'testuser',
-            'email' => 'test@example.com',
+            'email' => $freeEmail,
             'mail_preference_time' => 'daily',
             'prefers_anonymous_questions' => false,
         ]);
@@ -49,7 +50,7 @@
     $user->refresh();
 
     $this->assertSame('Test User', $user->name);
-    $this->assertSame('test@example.com', $user->email);
+    $this->assertSame($freeEmail, $user->email);
     $this->assertSame('testuser', $user->username);
     $this->assertNull($user->email_verified_at);
     $this->assertFalse($user->prefers_anonymous_questions);
@@ -153,7 +154,7 @@
         ->patch('/profile', [
             'name' => $user->name,
             'username' => 'valid_username',
-            'email' => 'new@email.address',
+            'email' => fake()->unique()->freeEmail(),
             'prefers_anonymous_questions' => false,
         ])
         ->assertSessionHasNoErrors();
@@ -462,3 +463,19 @@
         ->and($user->is_uploaded_avatar)->toBeFalse()
         ->and(session('flash-message'))->toBe('Updating avatar using GitHub.');
 });
+
+test('reject profile information update with fake email', function () {
+    $user = User::factory()->create();
+
+    $response = $this
+        ->actingAs($user)
+        ->patch('/profile', [
+            'name' => 'Test User',
+            'username' => 'testuser',
+            'email' => 'test@example.com',
+            'mail_preference_time' => 'daily',
+            'prefers_anonymous_questions' => false,
+        ]);
+
+    $response->assertInvalid('email');
+});
diff --git a/tests/Http/Register/CreateTest.php b/tests/Http/Register/CreateTest.php
index efe07e6c6..e98f80806 100644
--- a/tests/Http/Register/CreateTest.php
+++ b/tests/Http/Register/CreateTest.php
@@ -22,7 +22,7 @@
     $response = $this->from('/register')->post('/register', [
         'name' => 'Test User',
         'username' => 'testuser',
-        'email' => 'test@example.com',
+        'email' => fake()->unique()->freeEmail(),
         'password' => 'm@9v_.*.XCN',
         'password_confirmation' => 'm@9v_.*.XCN',
         'terms' => true,
@@ -40,7 +40,7 @@
     $payload = [
         'name' => 'Test User',
         'username' => 'testuser',
-        'email' => 'test@example.com',
+        'email' => fake()->unique()->freeEmail(),
         'password' => 'password',
         'password_confirmation' => 'password',
     ];
@@ -85,7 +85,7 @@
     $response = $this->from('/register')->post('/register', [
         'name' => 'Test User',
         'username' => 'testuser',
-        'email' => 'test@example.com',
+        'email' => fake()->unique()->freeEmail(),
         'password' => 'password',
         'password_confirmation' => 'not-password',
     ]);
@@ -98,7 +98,7 @@
     $response = $this->from('/register')->post('/register', [
         'name' => 'Test User',
         'username' => 'testuser',
-        'email' => 'test@example.com',
+        'email' => fake()->unique()->freeEmail(),
         'password' => 'password',
         'password_confirmation' => 'not-password',
         'terms' => false,
@@ -116,7 +116,7 @@
     $response = $this->from('/register')->post('/register', [
         'name' => 'Test User',
         'username' => 'testuser',
-        'email' => 'test@example.com',
+        'email' => fake()->unique()->freeEmail(),
         'password' => 'password',
         'password_confirmation' => 'password',
     ]);
@@ -126,14 +126,15 @@
 });
 
 test('email must be unique', function () {
+    $freeEmail = fake()->unique()->freeEmail();
     User::factory()->create([
-        'email' => 'test@example.com',
+        'email' => $freeEmail,
     ]);
 
     $response = $this->from('/register')->post('/register', [
         'name' => 'Test User',
         'username' => 'testuser1',
-        'email' => 'test@example.com',
+        'email' => $freeEmail,
         'password' => 'password',
         'password_confirmation' => 'password',
     ]);
@@ -148,7 +149,7 @@
     $response = $this->from('/register')->post('/register', [
         'name' => 'Test User',
         'username' => 'testuser',
-        'email' => 'test@example.com',
+        'email' => fake()->unique()->freeEmail(),
         'password' => 'pass',
         'password_confirmation' => 'pass',
     ]);
@@ -224,7 +225,7 @@
     $response = $this->from('/register')->post('/register', [
         'name' => 'Test User',
         'username' => $username,
-        'email' => 'test@laravel.com',
+        'email' => fake()->unique()->freeEmail(),
         'password' => 'password',
         'password_confirmation' => 'password',
     ]);
@@ -277,16 +278,17 @@
 ]);
 
 test("user's name can contain blank characters", function (string $given, string $expected) {
+    $freeEmail = fake()->unique()->freeEmail();
     $response = $this->from('/register')->post('/register', [
         'name' => $given,
         'username' => 'testuser',
-        'email' => 'test@laravel.com',
+        'email' => $freeEmail,
         'password' => 'password',
         'password_confirmation' => 'password',
         'terms' => true,
     ]);
 
-    $user = User::where('email', 'test@laravel.com')->first();
+    $user = User::where('email', $freeEmail)->first();
 
     expect($user->name)->toBe($expected);
 })->with([
@@ -299,7 +301,7 @@
     $this->from('/register')->post('/register', [
         'name' => 'Test User',
         'username' => 'testuser1',
-        'email' => 'test@example.com',
+        'email' => fake()->unique()->freeEmail(),
         'password' => 'password',
         'password_confirmation' => 'password',
         'terms' => true,
@@ -307,3 +309,23 @@
 
     expect(User::first()->prefers_anonymous_questions)->toBeTrue();
 });
+
+test('reject fake emails', function () {
+    Http::fake([
+        'https://www.google.com/recaptcha/api/siteverify' => Http::response([
+            'success' => true,
+        ]),
+    ]);
+
+    $response = $this->from('/register')->post('/register', [
+        'name' => 'Test User',
+        'username' => 'testuser',
+        'email' => 'test@example.com',
+        'password' => 'm@9v_.*.XCN',
+        'password_confirmation' => 'm@9v_.*.XCN',
+        'terms' => true,
+        'g-recaptcha-response' => 'valid',
+    ]);
+
+    $response->assertInvalid('email');
+});