diff --git a/config/rector/sets/cakephp60.php b/config/rector/sets/cakephp60.php
index 56d2a56..3762241 100644
--- a/config/rector/sets/cakephp60.php
+++ b/config/rector/sets/cakephp60.php
@@ -256,6 +256,12 @@
             'Cake\Log\Engine\FileLog' => ['_path', '_file', '_size'],
         ],
 
+        'Mailer' => [
+            'Cake\Mailer\Transport\SmtpTransport' => [
+                '_socket', '_content', '_lastResponse',
+            ],
+        ],
+
         'ORM' => [
             'Cake\ORM\Association' => [
                 '_name', '_className', '_bindingKey', '_foreignKey', '_conditions',