Comment 2 for bug 424195

This is a standard mailman feature, but it is not a standard mailman default. At least, it hasn't been the default on any of the systems that I use. The problem is that you get a message without List-Id headers, so (a) it doesn't filter properly and (b) your email client can't figure out that it should "reply list" instead of "reply all". Ultimately, this ends up encouraging off-list communication, because hitting the "reply" button goes to the sender, when they've CCed you (which they always do, because they use Reply All instead of Reply List, because of this bug).