The ex.dnsbl.org zone is an ancillary zone to the dnsbl.org system. It can
be used as a domain based DNS-bl. When spammers are kicked off a partcipating
DNS provider's system, they are put into the *.in.dnsbl.org zone.
The ex.dnsbl.org zone can be used by DNS providers or other interested parties
to screen prospective clients before they move onto the system in the first place or even filter email at the hub level. The zone breaks down as follows:
127.0.0.2
domain has been banned for spamming easyDNS corporate mail hubs.
127.0.0.3
domain has been banned from easyDNS mailhubs. The domain has been added for the sole reason that has been spamming easyDNS customers. Addition to the ex.dnsbl.org zone with this value is done purely at the discretion of easyDNS and is not open to appeal. Domains that wind up here deserve it and it is pretty safe to filter these values at your mail hubs (you will probably
eliminate a lot of spam by doing so).