> Whenever I post a response to a list to which I subscribe, I receive the
> following message. My post goes to the list just fine ... but I get this
> every time I respond. I am not the list owner of the list from which
> this comes. He got it for a while and now, somehow, doesn't. No one else
> on the list has indicated (at least to the list) that they are similarly
> blessed. Does this have anything to do with Hale-Bopp???? Any idea as to
> how I may disabuse myself of this pain???

It's a delivery error message sent to the wrong place (you, as sender
of a message, instead of the list owner).  Send the error message to
the list owner and ask them to remove the bad address from the list.