You have received 500 notifications within 24 hours. This destination will temporarily be disabled to prevent flooding. Please visit the ArcSight notification page to view/acknowledge your notifications (if they need acknowledging). If you have not configured Acknowledgement of Notifications then you may contact Administrator to reconfigure notification thresholds
received with thanks . I'll check on the box and give feedback
one option is there you require to fine tune the rule which is triggering too many time.
another option you can modify the server.properties file.
notification.aggregation.max_nitifications=100 to any number
but i would suggest to fine tune the rule because 500 notification is too much.