Index: program/include/rcmail.php
===================================================================
--- program/include/rcmail.php	(revision c96c5a98af8b9374010ebb692c89f82d67faf72e)
+++ program/include/rcmail.php	(revision 317a7d9f677b50db12c5988f38abb10ade0634a5)
@@ -1062,4 +1062,7 @@
   public static function setcookie($name, $value, $exp = 0)
   {
+    if (headers_sent())
+      return;
+
     $cookie = session_get_cookie_params();
     setcookie($name, $value, $exp, $cookie['path'], $cookie['domain'],