[tlug] sendmail problems. Host lookup deferred.

[Nguyen Vu Hung <vuhung@example.com>]

Hello all,

I have problem with DNS and mail server.

My system is:

redhat 7.2
kernel 2.4.20
sendmail 9.11.6
bind 9.x

When I try to send email from admin@example.com to someone@example.com,
it get queued in /var/spool/queue like:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
V4
T1052375827
K1052375827
N1
P462
I8/3/19194
Mhost map: lookup (server.com): deferred
Fb
$_[192.168.1.2]
$rSMTP
$sorion
${daemon_flags}
${if_addr}xxx.xxx.xxx.xxx
S<admin@example.com>
RPFD:<someone@example.com>
H?P?Return-Path: <~Ag>
H??Received: from orion ([192.168.1.2])
        by ns.mycompany.com (8.11.6/8.12.7) with SMTP id h486VlU29604
        for <someone@example.com>; Thu, 8 May 2003 15:37:07 +0900
H?x?Full-Name: Administrator
H??Message-ID: <002c01c3152c$968ec870$0201a8c0@example.com>
H??From: "admin" <admin@example.com>
H??To: "someone" <someone@example.com>
H??Subject: test from 
H??Date: Thu, 8 May 2003 15:33:53 +0900
H??MIME-Version: 1.0
H??Content-Type: text/plain;
        charset="iso-2022-jp"
H??Content-Transfer-Encoding: 7bit
H??X-Priority: 3
H??X-MSMail-Priority: Normal
H??X-Mailer: Microsoft Outlook Express 6.00.2800.1158
H??X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


and a notice fires back:

%%%%%%%%%%%%%%%%%%%%%%%%%%%5
> I have been getting dozens of these, or just plain failure messages.
> 
> On 05/7/2003 4:58 AM, "Mail Delivery Subsystem"
> <MAILER-DAEMON@example.com> wrote:
> 
> >   **********************************************
> >   **      THIS IS A WARNING MESSAGE ONLY      **
> >   **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
> >   **********************************************
> > 
> > The original message was received at Wed, 7 May 2003 16:10:07 +0900
> > from [192.168.1.21]
> > 
> >  ----- The following addresses had transient non-fatal errors -----

> > <user@example.com>
> > 
> >  ----- Transcript of session follows -----

> > 451 zaf.att.ne.jp: Name server timeout
> > Warning: message still undelivered after 4 hours
> > Will keep trying until message is 5 days old
%%%%%%%%%%%%%%%%%%%%%%%%%%%

The network:

                                192.168.1.1
router          <---->           server-------------- ------> 192.168.1.2
x.x.x.x.57                      x.x.x.x.58           |------> 192.168.1.3
                                                     |------> 192.168.1.x

The email above was sent from a 192.168.1.x client. I dont know why but I
can send emails from x.x.x.x.58( the mail server itself) but from
192.168.1.x or outside, it is impossible.

Please help me.

thank you