[Exim] RBL don't work

Hi, I was working fine with option rbl_domains (using inputs.orbs.org,
outputs.orbs.org, rbl.maps.vix.com, etc, inputs.orbs.org achieve reject mail
more than others), but today, it doesn't work, neither rejected mail with
orbs. it seems that the problem is with the DNS servers of ORBS, does
somebody have the same problem or some explanation of what can be happening?

Thanks a lot
Rolando Guerra