diff --git a/Application/Controller/Admin/MailCheckBase.php b/Application/Controller/Admin/MailCheckBase.php
index 8e2a7c4..91f091f 100644
--- a/Application/Controller/Admin/MailCheckBase.php
+++ b/Application/Controller/Admin/MailCheckBase.php
@@ -1,17 +1,13 @@
 <?php
 
 /**
- * This Software is the property of Data Development and is protected
- * by copyright law - it is NOT Freeware.
- *
- * Any unauthorized use of this software without a valid license
- * is a violation of the license agreement and will be prosecuted by
- * civil and criminal law.
+ * 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 <support@shopmodule.com>
+ * @author    D3 Data Development - Daniel Seifert <info@shopmodule.com>
  * @link      https://www.oxidmodule.com
  */
 
diff --git a/Application/Controller/Admin/MailCheckMenu.php b/Application/Controller/Admin/MailCheckMenu.php
index 3cde037..01330e6 100644
--- a/Application/Controller/Admin/MailCheckMenu.php
+++ b/Application/Controller/Admin/MailCheckMenu.php
@@ -1,17 +1,13 @@
 <?php
 
 /**
- * This Software is the property of Data Development and is protected
- * by copyright law - it is NOT Freeware.
- *
- * Any unauthorized use of this software without a valid license
- * is a violation of the license agreement and will be prosecuted by
- * civil and criminal law.
+ * 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 <support@shopmodule.com>
+ * @author    D3 Data Development - Daniel Seifert <info@shopmodule.com>
  * @link      https://www.oxidmodule.com
  */
 
diff --git a/Application/Controller/Admin/MailConfigCheck.php b/Application/Controller/Admin/MailConfigCheck.php
index 12aad82..e96ef82 100644
--- a/Application/Controller/Admin/MailConfigCheck.php
+++ b/Application/Controller/Admin/MailConfigCheck.php
@@ -1,16 +1,14 @@
 <?php
 
 /**
- * This Software is the property of Data Development and is protected
- * by copyright law - it is NOT Freeware.
- * Any unauthorized use of this software without a valid license
- * is a violation of the license agreement and will be prosecuted by
- * civil and criminal law.
- * http://www.shopmodule.com
+ * 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 <support@shopmodule.com>
- * @link          http://www.oxidmodule.com
+ * @author    D3 Data Development - Daniel Seifert <info@shopmodule.com>
+ * @link      https://www.oxidmodule.com
  */
 
 namespace D3\MailConfigChecker\Application\Controller\Admin;
diff --git a/Application/Controller/Admin/MailInfoPage.php b/Application/Controller/Admin/MailInfoPage.php
index 226a77b..baa5aba 100644
--- a/Application/Controller/Admin/MailInfoPage.php
+++ b/Application/Controller/Admin/MailInfoPage.php
@@ -1,16 +1,14 @@
 <?php
 
 /**
- * This Software is the property of Data Development and is protected
- * by copyright law - it is NOT Freeware.
- * Any unauthorized use of this software without a valid license
- * is a violation of the license agreement and will be prosecuted by
- * civil and criminal law.
- * http://www.shopmodule.com
+ * 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 <support@shopmodule.com>
- * @link          http://www.oxidmodule.com
+ * @author    D3 Data Development - Daniel Seifert <info@shopmodule.com>
+ * @link      https://www.oxidmodule.com
  */
 
 namespace D3\MailConfigChecker\Application\Controller\Admin;
diff --git a/Application/Controller/Admin/MailTester.php b/Application/Controller/Admin/MailTester.php
index 397db97..670d8cf 100644
--- a/Application/Controller/Admin/MailTester.php
+++ b/Application/Controller/Admin/MailTester.php
@@ -1,16 +1,14 @@
 <?php
 
 /**
- * This Software is the property of Data Development and is protected
- * by copyright law - it is NOT Freeware.
- * Any unauthorized use of this software without a valid license
- * is a violation of the license agreement and will be prosecuted by
- * civil and criminal law.
- * http://www.shopmodule.com
+ * 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 <support@shopmodule.com>
- * @link          http://www.oxidmodule.com
+ * @author    D3 Data Development - Daniel Seifert <info@shopmodule.com>
+ * @link      https://www.oxidmodule.com
  */
 
 namespace D3\MailConfigChecker\Application\Controller\Admin;
diff --git a/Application/Model/Constants.php b/Application/Model/Constants.php
index 7f83042..71d7fe1 100644
--- a/Application/Model/Constants.php
+++ b/Application/Model/Constants.php
@@ -1,5 +1,18 @@
 <?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\MailConfigChecker\Application\Model;
 
 class Constants