diff --git a/app/Http/Controllers/Auth/AuthController.php b/app/Http/Controllers/Auth/AuthController.php
index 7caeb6b87d..cd84b74d15 100644
--- a/app/Http/Controllers/Auth/AuthController.php
+++ b/app/Http/Controllers/Auth/AuthController.php
@@ -14,6 +14,7 @@ use Session;
 use Twig;
 use Validator;
 use Log;
+use Config;
 
 /**
  * Class AuthController
@@ -88,8 +89,8 @@ class AuthController extends Controller
         $foundUser = User::where('email', $credentials['email'])->where('blocked', 1)->first();
         if (!is_null($foundUser)) {
             // if it exists, show message:
-            $code    = $foundUser->blocked_code;
-            if(strlen($code) == 0) {
+            $code = $foundUser->blocked_code;
+            if (strlen($code) == 0) {
                 $code = 'general_blocked';
             }
             $message = trans('firefly.' . $code . '_error', ['email' => $credentials['email']]);
@@ -160,9 +161,20 @@ class AuthController extends Controller
         }
         // @codeCoverageIgnoreEnd
 
+
         $data             = $request->all();
         $data['password'] = bcrypt($data['password']);
 
+        // is user email domain blocked?
+        $parts = explode('@', $data['email']);
+        if (isset($parts[1]) && in_array($parts[1], Config::get('mail.blocked_domains'))) {
+
+            $validator->getMessageBag()->add('email', trans('validation.invalid_domain'));
+            $this->throwValidationException(
+                $request, $validator
+            );
+        }
+
         Auth::login($this->create($data));
 
         // get the email address
diff --git a/config/mail.php b/config/mail.php
index 31c5eaa8a2..be1dda92b8 100644
--- a/config/mail.php
+++ b/config/mail.php
@@ -15,7 +15,8 @@ return [
     |
     */
 
-    'driver'     => env('EMAIL_DRIVER', 'smtp'),
+    'blocked_domains' => ['trbvm.com', 'example.com'],
+    'driver'          => env('EMAIL_DRIVER', 'smtp'),
 
     /*
     |--------------------------------------------------------------------------
@@ -28,7 +29,7 @@ return [
     |
     */
 
-    'host'       => env('EMAIL_SMTP', 'smtp.mailgun.org'),
+    'host' => env('EMAIL_SMTP', 'smtp.mailgun.org'),
 
     /*
     |--------------------------------------------------------------------------
@@ -41,7 +42,7 @@ return [
     |
     */
 
-    'port'       => 587,
+    'port' => 587,
 
     /*
     |--------------------------------------------------------------------------
@@ -54,7 +55,7 @@ return [
     |
     */
 
-    'from'       => ['address' => env('EMAIL_USERNAME', null), 'name' => 'Firefly III Mailer'],
+    'from' => ['address' => env('EMAIL_USERNAME', null), 'name' => 'Firefly III Mailer'],
 
     /*
     |--------------------------------------------------------------------------
@@ -80,7 +81,7 @@ return [
     |
     */
 
-    'username'   => env('EMAIL_USERNAME', null),
+    'username' => env('EMAIL_USERNAME', null),
 
     /*
     |--------------------------------------------------------------------------
@@ -93,7 +94,7 @@ return [
     |
     */
 
-    'password'   => env('EMAIL_PASSWORD', null),
+    'password' => env('EMAIL_PASSWORD', null),
 
     /*
     |--------------------------------------------------------------------------
@@ -106,7 +107,7 @@ return [
     |
     */
 
-    'sendmail'   => '/usr/sbin/sendmail -bs',
+    'sendmail' => '/usr/sbin/sendmail -bs',
 
     /*
     |--------------------------------------------------------------------------
@@ -119,6 +120,6 @@ return [
     |
     */
 
-    'pretend'    => env('EMAIL_PRETEND', false),
+    'pretend' => env('EMAIL_PRETEND', false),
 
 ];
diff --git a/resources/lang/en/validation.php b/resources/lang/en/validation.php
index 9aede79f7d..af5cb84b1b 100644
--- a/resources/lang/en/validation.php
+++ b/resources/lang/en/validation.php
@@ -13,6 +13,7 @@ return [
     |
     */
 
+    'invalid_domain'          => 'Cannot register from this domain.',
     'file_already_attached'   => 'Uploaded file ":name" is already attached to this object.',
     'file_attached'           => 'Succesfully uploaded file ":name".',
     'file_invalid_mime'       => 'File ":name" is of type ":mime" which is not accepted as a new upload.',
@@ -92,7 +93,7 @@ return [
     |
     */
 
-    'custom'                  => [
+    'custom' => [
         'attribute-name' => [
             'rule-name' => 'custom-message',
         ],
@@ -109,6 +110,6 @@ return [
     |
     */
 
-    'attributes'              => [],
+    'attributes' => [],
 
 ];
diff --git a/resources/lang/nl/validation.php b/resources/lang/nl/validation.php
index 8c8a7cfa3c..28c536cba5 100644
--- a/resources/lang/nl/validation.php
+++ b/resources/lang/nl/validation.php
@@ -13,6 +13,7 @@ return [
     |
     */
 
+    'invalid_domain'          => 'Kan niet registereren vanaf dit domein.',
     'file_already_attached'   => 'Het geuploade bestand ":name" is al gelinkt aan deze transactie.',
     'file_attached'           => 'Bestand met naam ":name" is met succes geuploaded.',
     'file_invalid_mime'       => 'Bestand ":name" is van het type ":mime", en die kan je niet uploaden.',