Q. How can I use the dns-bl to filter out unwanted domains?
A. You can query the in.dnsbl.org zone for the domain name in question. The
server will respond with a "non-existant" domain if the domain name is not
in the list.
DOMAIN TO QUERY:
There are several responses, depending on the reason why the domain was
added. You can choose to ignore one or more, depending on your AUP, ethics,
"127.0.0.7"=>"Improper List Practices"
"127.0.0.8"=>"Botnet Activity / Malware"
The purpose of this service is to allow DNS providers to avoid the problem
of the same user hopping from DNS service to DNS service. It may not be
very useful as a "spam blocker" (However see next question).
The top 3 contributors are:
Q. Can I use the dnsbl as a "spam blocker"?
A. Because of the conspicuous absence of any other "domain based" blacklist,
an ancillary zone has been set up under ex.dnsbl.org,
see the ex.dnsbl.org zone page