diff --git a/app/Http/Controllers/Auth/RegisterController.php b/app/Http/Controllers/Auth/RegisterController.php
index a9dff70..6b77d27 100644
--- a/app/Http/Controllers/Auth/RegisterController.php
+++ b/app/Http/Controllers/Auth/RegisterController.php
@@ -28,6 +28,7 @@ use App\User;
 use Illuminate\Foundation\Auth\RegistersUsers;
 use Illuminate\Support\Facades\Hash;
 use Illuminate\Support\Facades\Validator;
+use Session;
 
 class RegisterController extends Controller
 {
@@ -71,6 +72,10 @@ class RegisterController extends Controller
     {
         $password = ['required', 'string', 'confirmed'];
 
+        $signupEnabled = Options::getOption('enable_registrations');
+        $signupOverride = Session::has('ALLOW_REGISTRATION_OVERRIDE') && Session::get('ALLOW_REGISTRATION_OVERRIDE') === true;
+        $signupOverrideEmail = Session::has('REGISTRATION_OVERRIDE_EMAIL') ? Session::get('REGISTRATION_OVERRIDE_EMAIL') : null;
+
         switch (Options::getOption('pw_security_policy')) { // this could be better structured, switch doesn't feel right
             case 'off':
                 $password = ['required', 'string', 'confirmed'];
@@ -99,7 +104,15 @@ class RegisterController extends Controller
             'dob.required' => __('Please enter your date of birth.'),
             'uuid.required' => __('Please enter a valid (and Premium) Minecraft username! We do not support cracked users.'),
             'acceptTerms.required' => __('Please accept the Community Guidelines, Terms of Service and Privacy Policy to continue.'),
-        ]);
+
+        ])->after(function (\Illuminate\Validation\Validator $validator) use ($signupEnabled, $signupOverride, $signupOverrideEmail) {
+
+            $email = $validator->getData()['email'];
+
+            $validator->errors()->addIf(!$signupEnabled && !$signupOverride, 'signup', __('We\'re sorry, but new sign ups are currently closed and invite-only.'));
+            $validator->errors()->addIf($signupOverride && $email !== $signupOverrideEmail, 'email', 'You must sign up with the email address you were invited with.');
+
+        });
     }
 
     /**
@@ -124,6 +137,13 @@ class RegisterController extends Controller
 
         $user->assignRole('user');
 
+        if (Session::get('ALLOW_REGISTRATION_OVERRIDE')) {
+            Session::forget([
+                'ALLOW_REGISTRATION_OVERRIDE',
+                'REGISTRATION_OVERRIDE_EMAIL'
+            ]);
+        }
+
         return $user;
     }
 }
diff --git a/resources/views/auth/register.blade.php b/resources/views/auth/register.blade.php
index b3c81c1..5dd1b34 100644
--- a/resources/views/auth/register.blade.php
+++ b/resources/views/auth/register.blade.php
@@ -14,9 +14,17 @@
                 <img src="{{ asset(config('adminlte.logo_img_xl')) }}" alt="logo" class="logo rounded mr-2">
               </div> <!-- main content start -->
 
-                @if(\App\Facades\Options::getOption('enable_registrations') == true)
+                @if(\App\Facades\Options::getOption('enable_registrations') == true || session()->has('ALLOW_REGISTRATION_OVERRIDE'))
                     <p class="login-card-description">{{__('Sign up for an account')}}</p>
 
+                    @if(session()->has('ALLOW_REGISTRATION_OVERRIDE') && session('ALLOW_REGISTRATION_OVERRIDE') === true)
+                        <div class="alert alert-info">
+                            <strong><i class="fas fa-info-circle"></i> {{ __('Invite only registration') }}</strong>
+                            <p>{{ __('You are signing up with an invitation. Please use the original email address you were invited with to complete your registration. Any other email address will not work.') }}</p>
+                            <p>{{ __('If you close the browser or otherwise clear your cookies, this page will NOT be available again if registrations are still closed.') }}</p>
+                        </div>
+                    @endif
+
                     @if(\App\Facades\Options::getOption('pw_security_policy') !== 'off')
 
                         <div class="alert alert-warning alert-dismissible">