diff --git a/app/Http/Controllers/Settings/Email.php b/app/Http/Controllers/Settings/Email.php
index 2ccc438d9..510ad6ade 100644
--- a/app/Http/Controllers/Settings/Email.php
+++ b/app/Http/Controllers/Settings/Email.php
@@ -4,8 +4,10 @@ namespace App\Http\Controllers\Settings;
 
 use App\Abstracts\Http\Controller;
 use App\Http\Requests\Setting\Setting as Request;
+use App\Models\Common\Company;
 use App\Models\Common\EmailTemplate;
 use App\Models\Setting\Setting;
+use App\Utilities\Installer;
 use Illuminate\Support\Str;
 
 class Email extends Controller
@@ -58,6 +60,8 @@ class Email extends Controller
         $fields = $request->all();
         $prefix = $request->get('_prefix', 'email');
 
+        $total_companies = Company::count();
+
         foreach ($fields as $key => $value) {
             $real_key = $prefix . '.' . $key;
 
@@ -72,6 +76,10 @@ class Email extends Controller
                 continue;
             }
 
+            if ($total_companies == 1) {
+                $this->oneCompany($real_key, $value);
+            }
+
             setting()->set($real_key, $value);
         }
 
@@ -114,4 +122,32 @@ class Email extends Controller
         unset($fields[$subject_key]);
         unset($fields[$body_key]);
     }
+
+    protected function oneCompany($real_key, $value)
+    {
+        if (empty($value)) {
+            return;
+        }
+
+        switch ($real_key) {
+            case 'email.protocol':
+                Installer::updateEnv(['MAIL_MAILER' => '"' . $value . '"']);
+                break;
+            case 'email.smtp_host':
+                Installer::updateEnv(['MAIL_HOST' => '"' . $value . '"']);
+                break;
+            case 'email.smtp_port':
+                Installer::updateEnv(['MAIL_PORT' => '"' . $value . '"']);
+                break;
+            case 'email.smtp_username':
+                Installer::updateEnv(['MAIL_USERNAME' => '"' . $value . '"']);
+                break;
+            case 'email.smtp_password':
+                Installer::updateEnv(['MAIL_PASSWORD' => '"' . $value . '"']);
+                break;
+            case 'email.smtp_encryption':
+                Installer::updateEnv(['MAIL_ENCRYPTION' => '"' . $value . '"']);
+                break;
+        }
+    }
 }