> I always send a rather curt message to the helpless person's e-mail.
> You're right--it probably does no good to post the instructions on the
> list.
I don't consider the person to be helpless. They signed up for the list in
the first place; it did not just suddenly appear one day, and if they want
out, the instructions are plainly written at the bottom of every post, and
all it takes is one click.