Remove x_frame_options env

program/include/rcmail_output_html.php

@@ -68,7 +68,6 @@ class rcmail_output_html extends rcmail_output
         $this->devel_mode = $this->config->get('devel_mode');
 
         $this->set_env('task', $task);
-        $this->set_env('x_frame_options', $this->config->get('x_frame_options', 'sameorigin'));
         $this->set_env('standard_windows', (bool) $this->config->get('standard_windows'));
         $this->set_env('locale', $_SESSION['language']);
         $this->set_env('devel_mode', $this->devel_mode);