David,
They do say you learn something new every day, so you have. :-)
Indeed. And I'm sharing the knowledge:
(click "Show message history" if the result table is initially hidden)
I have been using this for years in Yahoo, and it is extremely useful
for saving the admin from having to forward lots of replies to someone
else.
Remember this is an announcement group, as that may make a difference.
An interesting thing is that I didn't find this behavior in the Y!Groups equivalent of an Announcement Group - one with the Who can post? row in the Access Settings table set to Moderators Only.
But I did find that behavior, and more, in Discussion groups. Refer to the table in the cited message. Very surprising.
In the original Yahoo Groups, the sender's e-mail address was in the
From: header and there was no Reply-To: header.
From some old messages tucked away in my email folders I can confirm that for groups with their Reply To set to Sender. The groups in question allowed member posting.
I didn't find any examples of Reply-To being present (pre-DMARC) in those groups, but I don't think that's meaningful - yours isn't a use case that would be particularly likely in a Freecycle-style group (the only ones I was in that were set Reply To Sender).
Shal
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