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List:       cobalt-users
Subject:    Re: [cobalt-users] Re: Returned email?
From:       Jeff Lasman <jblists () nobaloney ! net>
Date:       2000-01-31 16:28:59
[Download RAW message or body]

It's pretty self-explanatory.  Your "sender" domain name must resolve. That 
means you need to have reverse DNS service.

Here's the error message I get when I try to resolve your IP#:

   [admin admin]$ nslookup 198.92.128.204
   Server:  ns1.ns-one.net
   Address:  216.98.128.70

   *** ns1.nobaloney.net can't find 198.92.128.204: Non-existent host/domain

Here's part of your whois record:

   Domain servers in listed order:

      NS1.AUTOBOTS.NET                                  198.92.128.204
      NS2.AUTOBOTS.NET                                  198.92.128.205

Since ns1.autobots.net and www.autobots.net both resolve to the same IP#, 
and since ns2.autobots.net resolves to the next IP# higher, you're using a 
very poor DNS implementation.  At best you've got two independent 
nameservers on the same subnet; at worst you have them on the same 
machine.  If you're machine or subnet ever goes down for any reason, the 
whole world will think your domain doesn't exist.  Not good.

Either you're not running reverse name service on your DNS, OR you don't 
have Reverse DNS properly delegated to you by your IP# provider.

The people you're trying to send email to don't accept email from sites 
without reverse DNS; they presumably do this in an attempt to avoid spam, 
as many spammers use sender addresses that don't resolve.

You need to talk to someone who knows how to do DNS right (we sell DNS 
services, so you might consider this a self-serving statement <smile>); 
preferably your upstream (bbnplanet or someone using them, perhaps), as 
there's nothing you can do if they're not delegating reverse dns to you.

Jeff

At 12:41 PM 1/30/00  Jonathan Park wrote:
>Here is the complete headers:
>==================================================
>
>    **********************************************
>     **      THIS IS A WARNING MESSAGE ONLY      **
>     **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
>     **********************************************
>
>The original message was received at Sat, 29 Jan 2000 02:02:10 -0500 (EST)
>from ida01.pub02.mail.com [165.251.48.70]
>
>    ----- The following addresses had transient non-fatal errors -----
><paul.vandezande@chello.be>
>
>    ----- Transcript of session follows -----
>... while talking to in-mx.chello.be.:
> >>> MAIL From:<admin@www.autobots.net> SIZE=814
><<< 451 <admin@www.autobots.net>... Sender domain must resolve
>... while talking to br-mx.chello.be.:
> >>> MAIL From:<admin@www.autobots.net> SIZE=814
><<< 451 <admin@www.autobots.net>... Sender domain must resolve
><paul.vandezande@chello.be>... Deferred: 451 <admin@www.autobots.net>...
>Sender domain must resolve
>Warning: message still undelivered after 4 hours
>Will keep trying until message is 5 days old
>===================================================
>
>
> >Message: 3
> >Reply-To: <dan@hilarious.com>
> >From: "Dan" <dan@hilarious.com>
> >To: <cobalt-users@list.cobalt.com>
> >Subject: RE: [cobalt-users] Returned Email?
> >Date: Sun, 30 Jan 2000 10:35:16 -0500
> >charset="iso-8859-1"
> >Reply-To: cobalt-users@list.cobalt.com
> >
> >It would help if you posted the complete headers with no changes.

--
Jeff Lasman, nobaloney.net
<jblists@nobaloney.net>
<www.nobaloney.net>, <www.mailtraqna.com>, <www.email-lists.com>


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