Jonas Maebe wrote

Yes, see the mail below (that person's email address started bouncing recently and he was automatically unsubscribed from the list because of that though).

I was "the person below", and I'd like to apologise, explain, and have a very subdued rant.

First, an apology. Something went wrong in a script on our site and it bounced messages. I'm sorry.

Second, an explanation. The reason things went wrong is that this list started distributing messages with suspect Received: headers. These originated at T-Online who apparently changed their email routing, the next time the only member of this list who uses T-Online posted our business systems were knocked out. Perhaps somebody would like to confirm that there is some RFC that permits a machine name of about 110 characters in a Received: header?

Third, a rant. Our systems were knocked out at 16:00 one Saturday afternoon. That was the first time we'd had an outage for about seven years. It's also the first time for seven years that I was in a position that I couldn't get at them and work out what was going on. I think people can probably work out for themselves how I feel about that.