diff --git a/Application/Controller/Admin/SmtpChecker.php b/Application/Controller/Admin/SmtpChecker.php
new file mode 100644
index 0000000..387a8ca
--- /dev/null
+++ b/Application/Controller/Admin/SmtpChecker.php
@@ -0,0 +1,110 @@
+<?php
+
+/**
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * https://www.d3data.de
+ *
+ * @copyright (C) D3 Data Development (Inh. Thomas Dartsch)
+ * @author    D3 Data Development - Daniel Seifert <info@shopmodule.com>
+ * @link      https://www.oxidmodule.com
+ */
+
+declare(strict_types=1);
+
+namespace D3\SmtpChecker\Application\Controller\Admin;
+
+use Assert\Assert;
+use Assert\InvalidArgumentException;
+use Net_SMTP;
+use OxidEsales\Eshop\Application\Controller\Admin\AdminDetailsController;
+use OxidEsales\Eshop\Application\Model\Shop;
+use OxidEsales\Eshop\Core\Registry;
+use PEAR;
+
+class SmtpChecker extends AdminDetailsController
+{
+    protected bool $debug = true;
+
+    protected string $host;
+
+    protected Net_SMTP $smtp;
+
+    public function __construct()
+    {
+        parent::__construct();
+
+        /** @var Shop $activeShop */
+        $activeShop = Registry::getConfig()->getActiveShop();
+
+        $this->host = Registry::getRequest()->getRequestEscapedParameter('') ?? $activeShop->getFieldData('oxsmtp');
+
+        $this->checkDataAreSet();
+        $this->hostIsAvailable();
+
+/*
+        //$host = 'cloud1-vm279.de-nserver.de:587';
+        $from = 'mail@ds.data-develop.de';
+        $rcpt = array('test@ds.data-develop.de', 'test@daniel-seifert.com', 'recipient2@example.com');
+        //$rcpt = array('test@ds.data-develop.de');
+        $rcpt = array('test@daniel-seifert.com');
+        $subj = "Subject: Test Message\n";
+        $body = "Body Line 1\nBody Line 2";
+
+        if ( PEAR::isError( $e = $smtp->connect())) {
+            dumpvar(__METHOD__.__LINE__.PHP_EOL);
+            die($e->getMessage() . "\n");
+        }
+
+        if ( PEAR::isError( $smtp->mailFrom( $from))) {
+            die("Unable to set sender to $from\n");
+        }
+
+        foreach ($rcpt as $to) {
+            dumpvar($to.PHP_EOL);
+            if ( PEAR::isError( $res = $smtp->rcptTo( $to))) {
+                die("Unable to add recipient $to: " . $res->getMessage() . "\n");
+            }
+        }
+
+        /* Set the body of the message. */
+/*
+        if ( PEAR::isError( $res = $smtp->data( $subj . "\r\n" . $body))) {
+            dumpvar($res->getMessage());
+            die("Unable to send data\n");
+        }
+
+        /* Disconnect from the SMTP server. */
+/*
+        $smtp->disconnect();
+        */
+    }
+
+    protected function checkDataAreSet()
+    {
+    }
+
+    /**
+     * @throws InvalidArgumentException
+     * @return void
+     */
+    protected function hostIsAvailable()
+    {
+        $this->host = 'test.example.dev';
+        Assert::that(( $this->smtp = new Net_SMTP( $this->host ) ))->true('Unable to instantiate SMTP object');
+        $this->smtp->setDebug($this->debug);
+    }
+
+    protected function foo()
+    {
+        PEAR::isError( $e = $this->smtp->connect());
+        dumpvar(get_class($e));
+        die();
+        Assert::that(PEAR::isError( $e = $this->smtp->connect()))->false($e->getMessage());
+        {
+            dumpvar(__METHOD__.__LINE__.PHP_EOL);
+            die($e->getMessage() . "\n");
+        }
+    }
+}
\ No newline at end of file
diff --git a/composer.json b/composer.json
index f01f63b..c345178 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,8 @@
   "require": {
     "php": ">=7.3",
     "oxid-esales/oxideshop-ce": "6.8 - 6.14",
-    "pear/net_smtp": "^1.11"
+    "pear/net_smtp": "^1.11",
+    "beberlei/assert": "^3.3"
   },
   "require-dev": {
     "php": "^7.4",
@@ -50,7 +51,7 @@
   },
   "autoload": {
     "psr-4": {
-      "D3\\SMTPChecker\\": "../../../source/modules/d3/smtpchecker"
+      "D3\\SmtpChecker\\": "../../../source/modules/d3/smtpchecker"
     }
   },
   "scripts": {
diff --git a/menu.xml b/menu.xml
new file mode 100644
index 0000000..dc14f59
--- /dev/null
+++ b/menu.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<OX>
+    <OXMENU id="NAVIGATION_ESHOPADMIN">
+        <MAINMENU id="mxservice">
+            <SUBMENU id="MXSMTPCHECKER" cl="d3smtpchecker" />
+        </MAINMENU>
+    </OXMENU>
+</OX>
\ No newline at end of file
diff --git a/metadata.php b/metadata.php
index c01401a..c1cbf39 100644
--- a/metadata.php
+++ b/metadata.php
@@ -13,6 +13,8 @@
 
 declare(strict_types=1);
 
+use D3\SmtpChecker\Application\Controller\Admin\SmtpChecker;
+
 $sMetadataVersion = '2.1';
 
 $sModuleId = 'd3smtpchecker';
@@ -34,7 +36,7 @@ $aModule = [
     'email'       => 'support@shopmodule.com',
     'url'         => 'https://www.oxidmodule.com/',
     'controllers' => [
-//      'd3ControllerAlias' => D3\ThisModule\Application\Controller\Admin\d3Controller::class,
+      'd3smtpchecker' => SmtpChecker::class,
     ],
     'extend'      => [
 //      \OxidEsales\Eshop\Core\ShopControl::class => \D3\ThisModule\Modules\Core\ShopControl_MyModule::class