See the accompanying problem statement and rationale document for background. Those of us involved in the RBL SM project have spent most of our professional careers trying to improve open network connectivity. It is therefore with very mixed feelings that we deliberately seek to make any part of the network inaccessible to us or to make ourselves inaccessible to it.
Desperate times call for desperate measures.
Our ultimate goal, however, is not to stop connectivity but rather to stop spam from being sent to hosts we pay for or over links we pay for. Anyone who wants to work with us toward that goal does not belong on the MAPS RBL SM . This document will help you categorize yourself and help you identify yourself to us. These countermeasures to our defenses, as well as newly emerging sources of abuse have made it necessary to modify our own strategies in response. We will describe the RBL SM strategies in its earliest days before discussing the more recent and more insidious forms of e-mail abuse MAPS SM is attempting to control.