Users have created their own good and bad sender lists. When they save it, the changes do not appear to be applied right away. The users are still getting messages that should be blocked via the bad senders list.
This is due to the default settings on the Symantec Messaging Gateway to only replicate user defined settings once every 24 hours. This can be changed in the Control Center settings.
Follow these steps to change the schedule for Users settings replication.