program/steps/mail/show.inc
@@ -23,8 +23,11 @@ $PRINT_MODE = $_action=='print' ? TRUE : FALSE; // allow this request to be cached send_future_expire_header(); // allow caching, unless remote images are present if ((bool)get_input_value('_safe', RCUBE_INPUT_GET)) send_nocacheing_headers(); else send_future_expire_header(); // similar code as in program/steps/mail/get.inc if ($_GET['_uid'])