I'm using a Lenny system to host Postfix and Windows 2003 for name
resolution. More frequently than I probably should, I will see NOQUEUE
in /var/log/mail.log related to DNS lookups. I've not yet narrowed it
down to forward lookups, reverse lookups or both.
I originally suspected the Windows box but I can reproduce these
failures on other systems from the nslookup command line tool and
without using Windows 2003 for name resolution. Also on systems without
Postfix. So I started Googling and find hits like this one:
http://ubuntuforums.org/showthread.php?t=827449
My command line errors look the same as reported at that URL.
nslookup X.X.X.X
;; Got recursion not available from x.x.x.x, trying next server
;; Got recursion not available from x.x.x.x, trying next server
Server: x.x.x.x
Address: x.x.x.x#53
Non-authoritative answer:
*** Cant find X.X.X.X: No answer
Usually for me, querying a single IP will fail the first time, then
subsequent lookups against the same data will succeed. The only way
I've been able to reproduce it in succession was if an IP address
lookup fails (say 12.34.56.78) I can query 12.34.56.79, .80, .81 to see
the recursion not available message.
At this point I'm not sure if it's a problem with NSLOOKUP, or
whatever DNS library Lenny is using, or my environment specifically
so.... Has anyone run across this problem and defeated it?
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