I have a customer with SBS 2008, running Exchange 2007 SP1. I can't seem to get the recipient filtering to work. All I am trying to do is filter out recipients that are not listed in the GAL. I have enabled Recipient Filtering under Org Config / Hub Transport and I have checked the box that reads "Block messages sent to recipients not listed in the Global Address List. I have verified the settings with both EMC and EMS.
Even with this enabled, I still get an "Ok" response from the SMTP connector when RCPT TO'ing an invalid address.
What am I missing here? Any help would be greatly appreciated.