diff --git a/module/mail/ui/detect.html.php b/module/mail/ui/detect.html.php
index db2a32675b..55201f89ca 100644
--- a/module/mail/ui/detect.html.php
+++ b/module/mail/ui/detect.html.php
@@ -12,6 +12,7 @@ namespace zin;
 
 formPanel(
     set::labelWidth('11em'),
+    set::size('sm'),
     formGroup(
         set::width('1/2'),
         set::label($lang->mail->inputFromEmail),
diff --git a/module/mail/ui/edit.html.php b/module/mail/ui/edit.html.php
index 7713f70720..9a053181fc 100644
--- a/module/mail/ui/edit.html.php
+++ b/module/mail/ui/edit.html.php
@@ -150,7 +150,6 @@ formPanel
         set::items($config->charsets[$this->cookie->lang]),
     ),
     set::actions($formActions),
-    set::actionsClass('w-1/2'),
 );
 
 div
diff --git a/module/mail/ui/index.html.php b/module/mail/ui/index.html.php
new file mode 100644
index 0000000000..497275839f
--- /dev/null
+++ b/module/mail/ui/index.html.php
@@ -0,0 +1,24 @@
+<?php
+declare(strict_types=1);
+/**
+ * The index view file of mail module of ZenTaoPMS.
+ * @copyright   Copyright 2009-2023 禅道软件（青岛）有限公司(ZenTao Software (Qingdao) Co., Ltd. www.zentao.net)
+ * @license     ZPL(https://zpl.pub/page/zplv12.html) or AGPL(https://www.gnu.org/licenses/agpl-3.0.en.html)
+ * @author      Wang Yidong <yidong@easycorp.ltd>
+ * @package     mail
+ * @link        https://www.zentao.net
+ */
+namespace zin;
+
+formPanel
+(
+    set::title($lang->mail->selectMTA),
+    set::size('sm'),
+    set::bodyClass('text-center'),
+    set::actions(array
+    (
+        common::hasPriv('mail', 'detect') ? array('url' => inLink('detect'), 'text' => $lang->mail->smtp) : null
+    )),
+);
+
+render();