What are Custom RBLs?

The Custom RBLs feature lets you add custom DNS-based RBLs and URIBLs to your account that we do not currently monitor.

The list of RBLs we monitor at any one time can vary, as RBLs come and go on a regular basis. Our base list of RBLs are chosen for their reliability and overall confidence in the community.

An RBL missing from our default list is still usable. If you have a paid or in-house RBL that you’d like to use, or simply one we're not currently monitoring, you can add it via our Portal.