add exception message to fail message for mail test

app/Http/Controllers/Admin/Settings/MailController.php

@@ -128,7 +128,7 @@ class MailController extends Controller
             Notification::route('mail', $request->user()->email)
                 ->notify(new MailTested($request->user()));
         } catch (Exception $exception) {
-            $this->alert->danger(trans('base.mail.test_failed'))->flash();
+            $this->alert->danger(trans('base.mail.test_failed') . ' ' . $exception->getMessage())->flash();
 
             return redirect()->route('admin.settings.mail');
         }

resources/lang/en/base.php

@@ -88,6 +88,6 @@ return [
     ],
     'mail' => [
         'test_succeeded' => 'The test message was sent successfully!',
-        'test_failed' => 'Failed to send test message! Check your configuration and try again.',
+        'test_failed' => 'Failed to send test message! Error message:',
     ],
 ];