PBL

From Wiki.openrbl.org

The Policy Block List

see Spamhaus instead

The Spamhaus PBL is a DNSBL database of end-user IP address ranges which should not be delivering unauthenticated SMTP email to any Internet mail server except those provided for specifically by an ISP for that customer's use. The PBL helps networks enforce their Acceptable Use Policy for dynamic and non-MTA customer IP ranges.

PBL IP address ranges are added and maintained by each network participating in the PBL project, working in conjunction with the Spamhaus PBL team, to help apply their outbound email policies. Further known-to-be-dynamic IP address ranges are added and maintained by the Spamhaus PBL team.

Spamhaus encourages all dialup, DSL and cable modem providers to participate and submit their own PBL ranges.

IP Address Self-Service Removal Mechanism

A feature of the PBL is the elimination of 'false positives' with a server-identifying and automatic removal mechanism for single IP addresses. This allows end users with static IP addresses within a larger dynamic pool, and legitimate mail server operators, to assert that in their opinion their IP addresses are a trustworthy source of email and to automatically remove (supress) their IP addresses from the PBL database. Safeguards are built in to prevent abuse of this facility by spammers (and particularly by automated bots).