Please note that this is not the actual
http://www.rfc-ignorant.org/how_to_ip.html
webpage, but a suggested revised version of it by
Allen Smith.
How to Use IP-Based Blacklist Zones
General Concepts
The IP-based zones of the rfc-ignorant.org project use the standard
"flipped octets" notation of performing lookups.
If host 10.18.24.50 is connecting to you, you might perform a
DNS lookup of 50.24.18.10.ipwhois.rfc-ignorant.org. If an A-record
is returned, then the IP address "meets the criteria for the zone".
Quick reference for adding DNSBL support to popular packages (if you don't
see yours, figure it out and send
admin@rfc-ignorant.org a
description of how to use it):
Sendmail
Sendmail 8.10.x and above can make easy use of the included dnsbl m4
feature, via adding the following line (or one like it) to your
sendmail.mc file that you build your .cf from:
FEATURE(dnsbl, `ipwhois.rfc-ignorant.org',
`Rejected for bad WHOIS info on your IP - see
http://www.rfc-ignorant.org/')
