The RBL Setup menu allows configuration of the RBL (Real-time Black-hole Lists) to be used with this server. The first option is to Enable or Disable this server to use this functionality.
RBL checks must be Enabled for any of the following options to work. Also, remember that Remote Tests must be enabled in CAPE Center::Mail Filters::General Filter Settings::Filter Configuration for RBLs to work.
RBLs are a free service. These RBLs contain lists of hosts known to send spam. The spam filter contacts the RBL servers located on the Internet and if the message sender is listed in an RBL, a particular number of points is added to the total spam score of the message. You can enable or disable different RBL checks. All RBLs are enabled by default. To disable a RBL, check the corresponding box to the left.