Tim:
I'm guessing, because the announce list sets this list on the reply-to header because that's what they want you to do. I'm on both, and all the announce list messages that I see do that.
Patrick O'Callaghan:
Interesting. An obvious bug in the announce list setup. Maybe you should report it to them (since you're on the list and I'm not).
Why's that a bug? You *can't* post to the announce list, on purpose, it's read-only. So the replies have to be directed to somewhere where people can respond.