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Old 05-13-2009, 11:00 AM   #1
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Registered: May 2009
Location: Seattle, Wa.
Distribution: Slackware
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Slackware 12.2 and sendmail 8.14.3 Host name lookup failure

Hi I am new to linux org and hope I can receive the info I need here. I run skackware 12.2 and sendmail. I also run a mailing list of about 900 people. I recently switched to dsl from dialup and I have about 6 ip's
returning my mail with either "Hostname lookup failure" or Timeout waiting for data. All the other ip's on the list work fine. I have contacted these ip's and they say the problem is on my end, but I yet to figure it out. Although I have a static IP the only way to connect through the router is with DHCP. Although my DNS is programmed in the router, the DHCP automatically changes my resolv.conf to:

#Generated by dhcpcd for interface eth0

That is not my true DNS. That is the DNS for the router and when I manually change my resolv.conf to my true dns the emails still bounce.

Any help would be so much appreciated

Old 05-13-2009, 11:08 AM   #2
Registered: Dec 2006
Distribution: Slackware
Posts: 507

Rep: Reputation: 33
try looking in /etc/mail/ for the parameters that you need. I am doing some configuration in that file myself right now and I think you can put your providers in there and it will pull mail from them.

Im not 100% sure but I *think* that is where you should look.
Old 05-13-2009, 11:17 AM   #3
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Registered: May 2009
Location: Seattle, Wa.
Distribution: Slackware
Posts: 3

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These ip's can send mail in to me. I just can't send mail to them. I have no clue what or where to put parameters in Can you help me there? I hate being a pest but I really need to fix this problem and I am quite new to sendmail. Thanks. Here is one of the return email messages I get:

---------- Forwarded message ----------
Date: Wed, 22 Oct 2008 21:39:34 -0700
From: Mail Delivery Subsystem <MAILER-DAEMON>
Subject: Warning: could not send message for past 4 hours


The original message was received at Wed, 22 Oct 2008 17:31:11 -0700
from IDENT:1000@[]

----- Transcript of session follows -----
... while talking to
>>> EHLO
<<< 421 Timeout exceeded
... while talking to
>>> EHLO
<<< 421 Timeout exceeded
<>... Deferred: Name server: host name lookup failure
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old

Last edited by mirader9813; 05-13-2009 at 11:26 AM. Reason: To add more info


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