Stew,
I wish to ask the owner of a private group of which I'm a member
(archive invisible to public) to create a sub-group whose message
archive will be visible to all primary group members
In the Privacy section of the subgroup's Settings page, set the Visibility control to "Group listed in parent group, messages visible by parent group members". Note: if the subgroup's visibility has already been restricted to subgroup members only, then this option won't be available. One can only tighten Visibility, one cannot loosen it.
but posting only by sub-group members.
In the Message Policies section of the subgroup's Settings page, do not check "Allow Non Subscribers to Post".
Shal
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