As you may recall, we had this discussion about half a
year ago, and
it boils down to people not configuring their e-mail clients properly
to obey the reply-to directive in the e-mail headers of the list
messages.
Not totally. My client _does_ obey Reply-To:, and I not infrequently
see both the sender and the list in the To: when I do a reply.
I haven't looked at it closely enough to know why. I speculate that
when an incoming message specifies Reply-To:, the list adds itself
there rather than replacing the header entirely.
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