SMTP Error Problem with RBL Client

One of my friend told me he not received email from his relatives since 2 days ago. He guess maybe there was an error in our mail server.

So, I use my gmail account and send an email to one of my company mail account. Gmail can't send email, here the report :

This is an automatically generated Delivery Status Notification


Delivery to the following recipient failed permanently:


   


Technical details of permanent failure:

PERM_FAILURE: SMTP Error (state 14): 554 Service unavailable; Client host [209.85.132.245] blocked using relays.ordb.org; ordb.org was shut down on December 18, 2006. Please remove from your mailserver.

It said we must remove relays ordb.org from our mailserver. My company using postfix as mail server.

[email protected]:~$ sudo vi /etc/postfix/main.cf

smtpd_recipient_restrictions = permit_mynetworks,

        permit_sasl_authenticated,
        reject_non_fqdn_hostname,
        reject_non_fqdn_sender,
        reject_non_fqdn_recipient,
        reject_unauth_destination,
        reject_unauth_pipelining,
        reject_invalid_hostname,
        reject_rhsbl_client blackhole.securitysage.com,
        reject_rhsbl_sender blackhole.securitysage.com,
        reject_rbl_client relays.ordb.org,
        reject_rbl_client blackholes.easynet.nl,

Remove the 'reject_rbl_client relays.ordb.org' line or we can deactivate it. And now the problem are fix. :)