* implemented feature from #1484476

program/include/main.inc

@@ -57,6 +57,11 @@ function rcmail_startup($task='mail')
   // load configuration
   $CONFIG = rcmail_load_config();
 
+  // set session domain
+  if (isset($CONFIG['session_domain']) && !empty($CONFIG['session_domain'])) {
+    ini_set('session.cookie_domain', $CONFIG['session_domain']);
+  }
+
   // set session garbage collecting time according to session_lifetime
   if (!empty($CONFIG['session_lifetime']))
     ini_set('session.gc_maxlifetime', ($CONFIG['session_lifetime']) * 120);

program/include/session.inc

@@ -172,9 +172,13 @@ function sess_regenerate_id()
   sess_destroy(session_id());
 
   session_id($random);
-  $cookie = session_get_cookie_params();
-  setcookie(session_name(), "", time() - 3600);
-  setcookie(session_name(), $random, $cookie['lifetime'] ? time() + $cookie['lifetime'] : 0, $cookie['path']);
+
+  $cookie    = session_get_cookie_params();
+  $_lifetime = $cookie['lifetime'] ? time() + $cookie['lifetime'] : 0;
+
+  setcookie(session_name(), '', time() - 3600);
+  setcookie(session_name(), $random, $_lifetime, $cookie['path'],
+    $cookie['domain']);
 
   return true;
   }