diff --git a/src/mibew/js/source/chat/model_views/controls/send_mail.js b/src/mibew/js/source/chat/model_views/controls/send_mail.js
index fb01a547..042b2f5a 100644
--- a/src/mibew/js/source/chat/model_views/controls/send_mail.js
+++ b/src/mibew/js/source/chat/model_views/controls/send_mail.js
@@ -51,7 +51,7 @@
                 var link = this.model.get('link');
                 var page = Mibew.Objects.Models.page;
                 if (link) {
-                    var winParams = this.model.get('windowParams');
+                    var winParams = Mibew.Utils.buildWindowOptions(this.model.get('windowParams'));
 
                     var style = page.get('style');
                     var styleArg = '';
diff --git a/src/mibew/libs/chat.php b/src/mibew/libs/chat.php
index d14fb5f8..49cae754 100644
--- a/src/mibew/libs/chat.php
+++ b/src/mibew/libs/chat.php
@@ -358,7 +358,7 @@ function setup_chatview(Thread $thread)
     $chat_style = new ChatStyle(ChatStyle::getCurrentStyle());
     $style_config = $chat_style->getConfigurations();
     $data['chat']['windowsParams']['mail']
-        = $style_config['mail']['window_params'];
+        = $style_config['mail']['window'];
 
     // Load core style options
     $page_style = new PageStyle(PageStyle::getCurrentStyle());
diff --git a/src/mibew/libs/classes/Mibew/Style/ChatStyle.php b/src/mibew/libs/classes/Mibew/Style/ChatStyle.php
index a9c67a7e..f02c3c7c 100644
--- a/src/mibew/libs/classes/Mibew/Style/ChatStyle.php
+++ b/src/mibew/libs/classes/Mibew/Style/ChatStyle.php
@@ -148,7 +148,11 @@ class ChatStyle extends AbstractHandlebarsPoweredStyle implements StyleInterface
                 ),
             ),
             'mail' => array(
-                'window_params' => ''
+                'window' => array(
+                    'width' => 640,
+                    'height' => 480,
+                    'resizable' => true,
+                ),
             ),
             'screenshots' => array(),
         );
diff --git a/src/mibew/styles/chats/default/config.yml b/src/mibew/styles/chats/default/config.yml
index 5a6682e7..e308ff2b 100644
--- a/src/mibew/styles/chats/default/config.yml
+++ b/src/mibew/styles/chats/default/config.yml
@@ -8,8 +8,11 @@ chat:
         resizable: true
 
 mail:
-    # window_param use as param string in JavaScript window.open method
-    window_params: "toolbar=0,scrollbars=0,location=0,status=1,menubar=0,width=603,height=254,resizable=0"
+    # These params are used for send mail windows opened via JavaScript's window.open.
+    window:
+        height: 254
+        width: 603
+        resizable: false
 
 # Screenshots section describe all screenshots shiped with style
 # Params names should be equals to file names without extension. Pictures