[January 15, 2017 – UPDATE]
The RBL seems to be fully working again, so we’ve re-added it to our system.
[January 8, 2017]
rbl.efnetrbl.org started issuing false positives, due to what appears to have been their domain expiring.
We’ve removed this RBL from being checked by our platform, until they get their site and RBL back on track (if ever).
If you’ve received a notification regarding this RBL blacklisting your IPs or domains, you can safely ignore it.
Our system will automatically correct these false positives during the next checkup of your IPs/domains.