Re: Sendmail: Deferred: Name server: xxx.xxx.xxx: host name lookup failure

To add on...

I was using sendmail/mimedefang/clamav on freebsd6.0 (w/ probably
8.13.4 before the patch) and got the same issue. It only seemed
to have the problem w/ my local domain. I resolved it by running
bind on the local server w/ records for my local domain and having
forwarders point to my normal internal nameservers (M$). Before
switching my resolv.conf to point to localhost, it resolved all
domains correctly (via dig), but I kept getting those same errors
from sendmail. I think even putting it in /etc/hosts didn't work.

Anyhow, the workaround came through and I haven't looked back,
but it sure would be nice to understand this one better. It seems
googling brought up some stuff w/ sendmail not playing nice w/ M$
nameservers (or switch these around if you prefer to lay
appropriate blame) not working in certain instances but I forget
the details.

This may or may not be related.



mike




On Mon, Jul 17, 2006 at 04:30:22PM +0200, Bas Hendriks wrote:
Date: Mon, 17 Jul 2006 16:30:22 +0200
From: Bas Hendriks <bas@xxxxxxxx>
To: freebsd-isp@xxxxxxxxxxx
Subject: Sendmail: Deferred: Name server: xxx.xxx.xxx: host name lookup
failure

Hello,

I have a problem with one of my servers,
Suddenly i am getting a lot of "Deferred: Name server: xxx.xxx.xxx: host
name lookup failure" while DNS resolving on that box is ok(from the
command line de backend servers do resolve and are reachable). The mail
stays in the mailqueue.

This is a mailscanning server (Mailscanner/Spamassasin/Clamav), witch
functions as primary mx for several domains, after receiving mail it
forwards this mail to backend servers(Using mailertable: domain.com
smtp:backendserver-n.xxxx.xx).

Any pointers on how to debug this would be appreciated!

Best regards,
Bas Hendriks

--
extra info:
[bas@mailscanner bas]$uname -a
FreeBSD mailscanner.xxxxxx.xxx 6.0-RELEASE FreeBSD 6.0-RELEASE #0: Thu Nov
3 09:36:13 UTC 2005 root@xxxxxxxxxxxxxxx:/usr/obj/usr/src/sys/GENERIC
i386
[bas@mailscanner bas]$telnet 0 25
Trying 0.0.0.0...
Connected to 0.
Escape character is '^]'.
220 mailscanner.xxxxxx.xxx ESMTP Sendmail 8.13.4/8.13.4; Mon, 17 Jul 2006
16:19:58 +0200 (CEST)



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