Postfix and RBL trouble

[Andrew Galdes]

Hello postfix experts,

I have a SLOX 4.1 email server running postfix (postfix-1.1.12-12). When
i try to add RBL servers to the list (see below - reject_rbl_client) the
mail server stops forwarding emails. However, if i remove the RBL
servers, postfix functions fine. I don't see a syntax error so i'm
thinking that there may be a compatability issue with the pre-existing
options:

smtpd_recipient_restrictions =
 ldap:ldapmailenab
 permit_tls_clientcerts
 permit_sasl_authenticated
 permit_mynetworks
 check_client_access
 btree:/etc/postfix/dracd
 check_relay_domains
 reject_rbl_client relays.ordb.org
 reject_rbl_client sbl.spamhaus.org
 reject_rbl_client xbl.spamhaus.org
 reject_rbl_client spammers.v6net.org
 reject_rbl_client dun.dnsrbl.net
 reject_rbl_client vox.schpider.com
 reject_rbl_client whois.rfc-ignorant.org

Cheers,
-Andrew