Quite many people still have ORDB.ORG RBLs in their email
configurations. That service shut down 2006, and last week
the domain was poisoned.
So far about a dozen recipient domains have been bouncing
with referral to ORDB... That will probably continue.
Watch over your email configs, be especially wary of "free"
blacklists. They have this nasty tendency of becoming
poisonous..
/Matti Aarnio -- one of <[email protected]>