ordb.org errors

Mails are not going through now due to this popular recent issue below. does not like recipient.
Remote host said: 554 Service unavailable; Client host [xxxxx] blocked using relays.ordb.org; ordb.org was shut down on December 18, 2006. Please remove from your mailserver.
Giving up on

Thanks for the heads up. I assume you can fix this by removing relays.ordb.org from the “Realtime (SBL) Blacklists:” section in NodeWorx->System Services->Mail Server->MTA Settings. Is that correct?