You may have recieved some bounces from one of the perl.org MX's in the past few days. This is not because things are actually bouncing, but because someone in Australia (202.12.233.xx) is re-injecting posts via the nntp server. (This is why email->news gateways, especially when combined with news->email gateways can be very very bad.)
We've blocked him or her. But this is the second time we've blocked him. (And second IP address.) Maybe he'll get the hint this time. If you get one of these bounces, you can just ignore it. Your message has made it to the list.
I'm thinking about modifying the posting facility to reject the identifiable looping posts, but I'm worried that if the error says: SomeHeader not valid in posts. this persion will just $msg->Header->delete("SomeHeader") and suddenly we lose our ability to block them.