Can't receive mail from my ISP's domain.

Can't receive mail from my ISP's domain.

Post by spamfree_d.. » Tue, 09 Nov 1999 04:00:00

O Wise Ones:

I am running sendmail 8.9.4 on RedHat6.1 on a 586.  I am a dumb
newbie.  I have set up my machine as in etc/hosts and mail
comes and goes to all domains except my isp's.  I can send mail to my

ftp/telnet/web to trouble free.
Other things that may be useful?:  Reverse lookup on my ip resolves to

    **      THIS IS A WARNING MESSAGE ONLY      **

The original message was received at Wed, 3 Nov 1999 22:16:18 -0500
from [sen.der.ip.addy]

  ----- The following addresses had transient non-fatal errors -----

  ----- Transcript of session follows -----
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old



Attachment: Message/delivery-status

Reporting-MTA: dns;
Arrival-Date: Wed, 3 Nov 1999 22:16:18 -0500 (EST)

Action: delayed
Status: 4.4.1
Remote-MTA: DNS;
Last-Attempt-Date: Thu, 4 Nov 1999 02:35:39 -0500 (EST)
Will-Retry-Until: Mon, 8 Nov 1999 22:16:18 -0500 (EST)

I checked all the timeout settings and they seem fine. Any help would
be appreciated.  I apologize for any pertinent information that I have
not included.  Tell me what it is and I will post it.

-Notso Bright

Sent via
Before you buy.


Can't receive mail from my ISP's domain.

Post by QuestionExchang » Tue, 14 Dec 1999 04:00:00

>   ----- Transcript of session follows -----

> Warning: message still undelivered after 4 hours
> Will keep trying until message is 5 days old

This is the important bit right here. Your mail server tried to
reach '' and its connection timed out. That suggests
some sort of network configuration issue preventing their mail
server from reaching yours or yours from responding to them.
Log into your machine and type:
telnet smtp
(that's what your machine is trying) If you get: Smail- (#2 1999-Sep-5)
ready at Fri, 10 Dec 1999 16:35:05 -0700 (MST)
then things look fine. If you get an error or can't connect,
then you'll know what your problem is from there.
Feel free to email me with the results of doing this


  This answer is courtesy of


1. transition from isp 'A' to isp 'B' routing problem

I am switching from isp "a" to isp "b".  Each one has it's own
dedicated router on my DMZ. I have one server (email) with one nic
card on the DMZ.  I also have a third dedicated router on the DMZ
which goes to my private network.  Isp "b" is the one I am switching
to and want everything to go through.  Routing all internet traffic
from the private network to isp "b" was simple.

        isp "a"         Isp "b"
       -----------     -----------
       | router  |     | router  |
       -----------     -----------
            |               |              ----------
             ------------------------------| router | --> private
                     |                     ----------
                | mail server |

   The problem is going to be the transition period when email is
coming in through both isp's when some servers are sending to the old
ip and some to the new ip before everything is updated on the
   Currently the internet routes all my mail through isp "a" to my
dedicated ip address on the mail server and my default route on the
server is through isp "a". This works fine.  If I change my default
route to go through isp "b" I stop getting mail.  Apparently you
cannot come in through one router and return through a different one.
It seem I can only communicate with the internet through the router
which is the default route.
   By the way router "b" also has a dedicated ip but does address
translation to the DMZ network which is probably the problem.
   What I need is a way to route traffic that come from router "a"
back to router "a" and traffic from router "b" back to router "b".
   I have read many howto's and posts but none seem to address this
issue.  I was wondering if something like the following would work:
    ip route add default via router-A-ip nexthop via router-B-ip
I found a couple of posts which refered to this.  Also where can I
find a complete list of comands for ip?

   Thanks in advance for any help or suggestions you may have.

Joe D.

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