Actually, the domain exists, except that whois indicates that its =
record
expired on 4-Mar-2001. They need to renew their domain registration.

Ari

-----Original Message-----
From: Rask Ingemann Lambertsen [mailto:c948374-postfixstudent.dtu.dk]
Sent: Wednesday, May 02, 2001 11:42 AM
To: postfix-userspostfix.org
Subject: Re: Newbie(ish)... reject_unknown_sender_domain problem...

On Wed, May 02, 2001 at 03:44:11PM +0100, Peter Bates wrote:
[cut]
> but I seem to be seeing as fair few of these now, some from domains
> I would consider reasonably 'major' (such as computacenter.com listed
above).
>=20

Just becuase you may think of them as "major" doesn't magically fix =
their
DNS and mail system.

> Admittedly it might be a bit off-topic, but what do people
> do in this situation, in terms of verifying whether the problem
> is with their DNS lookups, or the domain at the other end, and
> if the latter, do they then try and contact postmasterdomain
> (or whoever) to advise them to fix their systems?

I often use a script that I developed for the purpose, but you can =
simply do
the CNAME, MX and A lookups by hand with e.g. dig or nslooklup. Here is =
the
output of my script for computacenter.com, btw:

----------
Test of domain computacenter.com started at Wed May 2 15:33:44 2001 =
UTC

Looking up CNAME records for computacenter.com...
No CNAME records found for computacenter.com (NXDOMAIN).

Looking up MX records for computacenter.com...
No MX records found for computacenter.com (NXDOMAIN), emulating one.

Preference Mail exchanger
0 computacenter.com

Looking up A records for computacenter.com...
No A records found for computacenter.com (NXDOMAIN)!

Test of domain computacenter.com ended at Wed May 2 15:33:44 2001 UTC
----------

I think that explains the problem. Obviously, in this case, trying
postmastercomputacenter.com won't do you any good. Look after their =
domain
contact addresses. Except it says NXDOMAIN, i.e. it doesn't exist at =
all.

Regards,
Rask Ingemann Lambertsen
--=20
/=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF\
| Please do NOT Cc: to me or the |=20
| mailing list. I am on the list.|

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