From: áÌÅËÓÅÊ äÏÍÏÒÁÄÏ× (alex_hhamail.ru)
Date: Thu Oct 02 2008 - 02:44:54 CDT

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-----Original Message-----
From: Sahil Tandon <sahiltandon.net>
To: postfix-userspostfix.org
Date: Wed, 1 Oct 2008 23:03:45 -0400
Subject: Re: receiving smtpd[25253] error from sender

>
> Wray, Oran <OWrayMarsh.net> wrote:
>
> > smtpd[25253]: NOQUEUE: reject: RCPT from
> > mailgw1.per-se.com[199.190.235.46]: 450 4.1.8
> > <daemoncss2.ndcorp.com>: Sender address rejected: Domain not found;
> > from=<daemoncss2.ndcorp.com> to=<owraymarsh.net> proto=ESMTP
> > helo=<mailgw1.per-se.com>
>
> Please post the output of 'postconf -n' and follow the instructions in
> the DEBUG_README (a document to which you were referred upon subscribing
> to this mailing list) when asking for help.
>
> The rejecting server has probably specified
> reject_unknown_sender_domain:
>
> http://www.postfix.org/postconf.5.html#reject_unknown_sender_domain
>
> % host css2.ndcorp.com
> Host css2.ndcorp.com not found: 3(NXDOMAIN)
?!

For domain lookup You should use whois instead of host

# whois css2.ndcorp.com
[Querying whois.verisign-grs.com]
[whois.verisign-grs.com]

Whois Server Version 2.0

Domain names in the .com and .net domains can now be registered
with many different competing registrars. Go to http://www.internic.net
for detailed information.

No match for domain "CSS2.NDCORP.COM".
>>> Last update of whois database: Thu, 02 Oct 2008 03:40:28 EDT <<<

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