diff --git a/app/Http/Controllers/CronController.php b/app/Http/Controllers/CronController.php
index 0e29913dd5..69f5e3f87e 100644
--- a/app/Http/Controllers/CronController.php
+++ b/app/Http/Controllers/CronController.php
@@ -2,7 +2,6 @@
 
 namespace FireflyIII\Http\Controllers;
 
-use FireflyIII\Models\Preference;
 use FireflyIII\User;
 
 /**
@@ -14,7 +13,10 @@ class CronController extends Controller
 {
 
     /**
+     * Firefly doesn't have anything that should be in the a cron job, except maybe this one, and it's fairly exceptional.
      *
+     * If you use SendGrid like I do, you can detect bounces and thereby check if users gave an invalid address. If they did,
+     * it's easy to block them and change their password. Optionally, you could notify yourself about it and send them a message.
      */
     public function sendgrid()
     {
@@ -28,21 +30,19 @@ class CronController extends Controller
         ];
         $fullURL    = $URL . '?' . http_build_query($parameters);
         $data       = json_decode(file_get_contents($fullURL));
-        $users      = [];
-        echo "<pre>\n";
-        // loop the result, if any.
+
+        var_dump($data);
+        /*
+         * Loop the result, if any.
+         */
         if (is_array($data)) {
             foreach ($data as $entry) {
                 $address = $entry->email;
                 $user    = User::where('email', $address)->first();
                 if (!is_null($user)) {
-                    $users[] = $user;
-                    echo "Blocked " . $user->email . " because a message bounced.\n";
-
-                    // create preference:
-                    $preference       = Preference::firstOrCreate(['user_id' => $user->id, 'name' => 'bounce']);
-                    $preference->data = $entry->reason;
-                    $preference->save();
+                    $user->blocked  = 1;
+                    $user->password = 'bounced';
+                    $user->save();
                 }
             }
         }
diff --git a/app/Http/Middleware/Authenticate.php b/app/Http/Middleware/Authenticate.php
index e83a32aefb..23026e7bde 100644
--- a/app/Http/Middleware/Authenticate.php
+++ b/app/Http/Middleware/Authenticate.php
@@ -52,6 +52,11 @@ class Authenticate
                 return redirect()->guest('auth/login');
             }
         }
+
+        if (intval($this->auth->user()->blocked) == 1) {
+            return redirect()->route('logout');
+        }
+
         // if logged in, set user language:
         $pref = Preferences::get('language', 'en');
         App::setLocale($pref->data);