David, the server blacklist does not pull from the RBLs configured within SmarterMail web interface. In the Service folder (i.e., C:\Program Files (x86)\SmarterTools\SmarterMail\Service) should be a file called BlacklistAwareConfig.xml. Unfortunately, to add or to remove from this list is a manual operation in SM16. This file contains the RBLs against which your server will test for blacklisting. You can copy from the spamConfig.xml file any additional RBLs. Look from any tags with <SpamIp4rLookup> and copy those into BlacklistAwareConfig.xml. Rename the tag to <SpamIp4rLookups>. In a future release of SmarterMail, we allow the server blacklist to be configurable from within the interface.