I've been adding dns blacklists through the courier webadmin with
great results. Wanted to add lashback to the list, and found this in
their info:

if you wish to check whether 192.168.1.100 is listed in the UBL, you
would perform a DNS lookup on 100.1.168.192.ubl.unsubscore.com

Is this how the web configured DNS blacklists work or do they simply
make a reverse DNS lookup on the IP address? I was hoping to migrate
the blacklist lookups to a localhost BIND and effectly use it as a
proxy for courier to make one single rdns lookup on, but if they all
operate like lashback, then thats not going to work with multiple
dnsbl's

Lisa.

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