--- program/include/rcube_html_page.php~	2011-01-29 08:55:12.000000000 -0600
+++ program/include/rcube_html_page.php	2011-02-10 12:34:16.439813090 -0600
@@ -192,6 +192,14 @@
             $page_header.= $this->charset . '" />'."\n";
         }
 
+        // add hint to disable DNS prefetching 
+        if (!headers_sent()) { 
+            header('X-DNS-Prefetch-Control: off'); 
+        } else { 
+            $__page_header.= '<meta http-equiv="x-dns-prefetch-control" content="off" />'."\n"; 
+        }
+        
+
         // definition of the code to be placed in the document header and footer
         if (is_array($this->script_files['head'])) {
             foreach ($this->script_files['head'] as $file) {