6 messages in net.sourceforge.lists.courier-usersRe: [courier-users] DNS lookup blacklist
FromSent OnAttachments
Lisa MuirJan 16, 2008 1:38 pm 
Sam VarshavchikJan 16, 2008 3:27 pm 
Gordon MessmerJan 16, 2008 3:36 pm 
Leigh S. Jones, KR6XJan 16, 2008 6:57 pm 
Lisa MuirJan 16, 2008 9:59 pm 
Arturo 'Buanzo' BusleimanJan 17, 2008 2:57 am 
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Subject:Re: [courier-users] DNS lookup blacklistActions...
From:Gordon Messmer (yiny@eburg.com)
Date:Jan 16, 2008 3:36:35 pm
List:net.sourceforge.lists.courier-users

Lisa Muir wrote:

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

Yes, that is the standard process for DNS based blacklists.

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

You can't reduce the number of lookups performed, but you can use a local DNS server for caching.