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Hi David,

* The recipients of the groups.io list receive a newly generated
message (with its own message-id).

That's optional.

In your Account preferences page there's a checkbox that is checked by default:
|_| I always want copies of my own messages

The effect of that checkbox is to cause the Message-Id to be replaced on messages you post. For some email services (Gmail notably among them) this allows you to see the message as returned from the group. Otherwise (if the Message-ID were left intact) Gmail would see a message with that same ID already in your account (the Sent folder) and would not display the "duplicate" message as received.

* Sometimes, the otherlist will be pruned from the headers, and
sometimes not (I haven't figured out the pattern here).

Possibly the distinction is whether the To or CC field was used? Also, there was a relevant change in late Jan or early Feb so that the CC field is no longer stripped. See the fifth item here:

* Replies on 'otherlist' tend to go to to the groups.io
list, which accepts it, at least if the group is
open to posting be non-members.

Accepted yes, but non-subscriber posts are always placed in moderation.

In addition, anyone on both lists/groups will get a separate copy of
each message, and it is unclear which one they should reply to.

Hmm...

Groups.io will insert a Reply-To field in the outbound header. The content of that header is set by one of your group's Settings. But none of the available choices will cause it to include the other group/list and if the member uses plain Reply that would likely exclude the other list, even if it were not removed from the To or CC. So I guess the member would need to use Reply-All to get the reply to go to both lists (and direct to the original poster).

Shal


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