Try this patch:diff --git a/include/api.tickets.php b/include/api.tickets.php
index 80cdd1f..60907d5 100644
--- a/include/api.tickets.php
+++ b/include/api.tickets.php
@@ -40,6 +40,7 @@ function getRequestStructure($format, $data=null) {
$supported = array_merge($supported, array('header', 'mid',
'emailId', 'to-email-id', 'ticketId', 'reply-to', 'reply-to-name',
'in-reply-to', 'references', 'thread-type',
+ 'flags' => array('bounce', 'auto-reply'),
'recipients' => array('*' => array('name', 'email', 'source'))
));
