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

> 
> Wray, Oran <[EMAIL PROTECTED]> wrote:
> 
> > smtpd[25253]: NOQUEUE: reject: RCPT from
> > mailgw1.per-se.com[199.190.235.46]: 450 4.1.8
> > <[EMAIL PROTECTED]>: Sender address rejected: Domain not found;
> > from=<[EMAIL PROTECTED]> to=<[EMAIL PROTECTED]> 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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