The Passive Spam Block List
psbl.surriel.com, also known as The Passive Spam Block List, is a relatively new blacklist to the DNSBL scene. Like most other blacklists, pbsl.surriel.com uses spamtraps and honeypots to gather its listing criteria. pbsl.surriel.com is an IP address based block list, and does not list URI’s or URL’s.
To become listed in the pbsl.surriel.com zone an email server must send an email to a spamtrap or honeypot address. At that time, the IP address of the sending server will be listed. Virus and bounce messages are filtered out of the system, leaving more than 99% of the listed addresses being confirmed as spam.