
How to Add RBL Lists - lugoj.org/docs/rbl.html
DNSBL Usage - www.blackholes.us/docs/usage.html
How DNSBL lookups work - www.declude.com/Articles.asp?ID=120
Using SORBS - www.sorbs.net/using.shtml
Blacklists, Blocklists, DNSBLs, and survival - www.scconsult.com/bill/dnsblhelp.html
DNSBL, from Wikipedia - en.wikipedia.org/wiki/DNSBL
DNS Blackhole Lists - subwiki.honeypot.net/cgi-bin/view/Freebsd/DnsBlackholeList
Blacklists — make the right choice - isc.sans.org/diary.html?storyid=3194
Domain name based DNS blackhole lists are commonly called RHSBLs. RHSBL stands for Right Hand Side Blackhole List, which refers to the right-hand side of the email address of the “envelope sender” - i.e. the domain name used by the sender.
RHSBL Usage - www.rfc-ignorant.org/how_to_domain.php
Technical details on how to use dnswl.org - www.dnswl.org/tech