451 error - ReadList.com

2 msg	Duplicate messages with always_bcc
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451 error
\ James D. Parra (16 Jan 2008)
. \ (Wietse Venema) (16 Jan 2008)
. \ James D. Parra (16 Jan 2008)

10 msg	Postfix 2.5 release candidate (and 2.6 snapshot...
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4 msg	Documentation enhancement: Adjusting DB file pe...
11 msg	I don't want Postfix to confirm users via telnet
3 msg	Question on Earthlink and dnsbl.sorbs.net
36 msg	Re: Enforced Outbound TLS (part deux)
6 msg	smtpd_proxy_filter to unix: problem
4 msg	Again troubles with postfix and cyrus-sasl
3 msg	Exclude local host from smtpd_proxy_filter
4 msg	transport nexthop nexthop
3 msg	TLS has been selected, but TLS support is not c...
2 msg	Which documentation to read for this..
4 msg	Exchange 2003 to Postfix maildir migration
7 msg	virtual_mailbox_base & LDAP
12 msg	Enforced Outbound TLS
2 msg	postfix+maildrop error
10 msg	Outgoing IP address

Subject:	451 error
Group:	Postfix-users
From:	James D. Parra
Date:	16 Jan 2008

Hello,

Noticed a suggestion to use rbl check in an earlier post to the list today,
however after adding bl.spamcop.net to main.cf mail from a certain domain
started to a 451 error;

From main.cf;

<Snip>
smtpd_client_restrictions =
permit_mynetworks
reject_rbl_client dnsbl.sorbs.net
reject_rbl_client zen.spamhaus.org
reject_rbl_client bl.spamcop.net
permit
<snip>

From /var/log/mail

Jan 15 15:42:53 postmaster postfix/smtpd[29594]: NOQUEUE: reject: RCPT from
s412.sureserver.com[216.35.197.113]: 451 Server configuration error;
from=<jamesp> to=<jamesp> proto=ESMTP
helo=<s412.sureserver.com>

After removing bl.spamcop.net mail from the domain started to come through
again. That domain doesn't send spam so it shouldn't be listed. Any ideas?

Many thanks,

James