diff --git a/app/Commands/LetsEncryptAddCommand.php b/app/Commands/LetsEncryptAddCommand.php
index 4721f7c..ebb1750 100644
--- a/app/Commands/LetsEncryptAddCommand.php
+++ b/app/Commands/LetsEncryptAddCommand.php
@@ -3,6 +3,7 @@
 namespace App\Commands;
 
 use Illuminate\Console\Scheduling\Schedule;
+use Illuminate\Support\Facades\Validator;
 use LaravelZero\Framework\Commands\Command;
 
 /**
@@ -21,7 +22,7 @@ class LetsEncryptAddCommand extends Command
      *
      * @var string
      */
-    protected $signature = 'lets-encrypt:add {email} {domain*} ';
+    protected $signature = 'lets-encrypt:add {email} {domain}';
 
     /**
      * The description of the command.
@@ -38,7 +39,25 @@ class LetsEncryptAddCommand extends Command
      */
     public function handle()
     {
-        $domains = $this->argument('domain');
+        $email = $this->argument('email');
+
+        // email for validator
+        $validator = Validator::make([
+            'email' => $email
+        ], [
+            'email' => ['email'],
+        ]);
+
+        // show if error if first argument is not a email
+        if ($validator->fails()) {
+            foreach ($validator->errors()->all() as $error) {
+                $this->error($error);
+            }
+
+            exit();
+        }
+
+        $domain = $this->argument('domain');
 
         // adding flags
         $domainFlags = '';
@@ -46,20 +65,13 @@ class LetsEncryptAddCommand extends Command
         // add file for domain
         $saved = [];
 
-        // create flags
-        foreach($domains as $domain) {
-            $domainFlags .= '-d '.$domain.' ';
-            $saved[$domain] = '/etc/letsencrypt/live/'.$domain.'/fullchain.pem';
-        }
-
-        system('certbot --non-interactive --agree-tos -m '.$this->argument('email').' --nginx '.$domainFlags);
+        system('certbot --non-interactive --agree-tos -m '.$this->argument('email').' --nginx -d '.$domain);
 
-        foreach($saved as $domain => $file) {
-            if (file_exists($file)) {
-                $this->info($domain.'...Success!');
-            } else {
-                $this->error($domain.'...Failed!');
-            }
+        // check for certificate
+        if (file_exists( '/etc/letsencrypt/live/'.$domain.'/fullchain.pem')) {
+            $this->info($domain.'...Success!');
+        } else {
+            $this->error($domain.'...Failed!');
         }
     }
 }