I was on a badly set-up mailing list once where someone has set their out of office, which replied to the list, which emailed the response to all including the

I was on a badly set-up mailing list once where someone has set their out of office, which replied to the list, which emailed the response to all including the OOO person,which posted to the list.. you see the problem! There was a whole night of this. I was on a student placement at the time and as I had only mamanged to unsub after about several thousand emails I spent a few nervous hours awaiting Sauron's gaze from IT support.