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From: Will Day (willdayrom.oit.gatech.edu)
Date: Sun Mar 03 2002 - 15:15:03 CST

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    A short time ago, at a computer terminal not so far away, imlinterconnect.net wrote:
    >mail-abuse.org has two forms of subscription.
    >
    >querymode and zone transfer.
    >
    >In query mode the mail server basically queries rbl.mail-abuse.org and
    >does the lookup. In zone transfer mode a local dns server does a zone
    >transfer of rbl.mail-abuse.org so the zone is actually on a local dns
    >server. In postfix it doesn't seem to make a distinction on where it
    >points...I stress "seem"...I could be missing it. I want to be sure
    >postfix is using the local dns server and not going out to
    >mail-abuse.org's server to try to query it.

    This is my understanding:

    If you have a local DNS server doing zone transfers of mail-abuse.org, then
    you have to make sure your postfix machine uses that local DNS server for
    lookups - ie, that you have the local DNS server specified in resolv.conf
    or whatnot.

    The local DNS server is that case is just acting like a caching nameserver,
    except that it happens to have the entire zone cached immediately. You
    have to tell your postfix machine to check that DNS server first;
    otherwise, the lookup will go to whatever DNS servers are listed in the SOA
    record for mail-abuse.org, and your machine is likely not one of those. 

    -- 
Will Day                  Those who would give up essential Liberty, to 
rom.oit.gatech.edu       purchase a little temporary Safety, deserve neither 
O&E / Tech Support        Liberty nor Safety.
UNIX System Programmer      - Benjamin Franklin, Penn. Assembly, Nov. 11, 1755
  -> Opinions expressed are mine alone and do not reflect OIT policy <-

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