The RBL monitor service was shut down on 5th of May 2016. Feel free to migrate your configuration to other services, for example: * https://www.rblmon.com/ * https://rblwatcher.com/ * http://rbl-check.org/en/ or use a tool-based approach using * https://github.com/matteocorti/check_rbl * https://github.com/logic/rblcheck So long, and thanks for all the fish, Michael