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Dan,

As Bruce said, there isn't a setting for that.

What you can do is set the group to All messages are moderated, or New Members Moderated. That way any posts from outside the small handful will be held in the pending list.

From there, you can change that individual to Not allowed (heading off future postings) and either just Delete the message or use Reject to send a templated message to explain why the user is not allowed to post.

Doing it this way makes the assumption that only a small fraction of the invited members would post a message. You can make the included text of your Invitation, and/or your Welcome notice suitably clear about this rule to minimize the number of members you'll need to deal with.

Those who don't post don't end up set to can't post, but if they don't post it doesn't matter.

I have a PTA group that runs on a similar basis: only a selected PTA unit board or committee chairs are allowed to post to the group (all of the PTA unit members can join the group). But rather than use Announcement-Only Group I simply leave the group on "All messages are moderated". It has actually been very rare that members attempt to post, and when they do it is a whole lot more in the PTA spirit for them to receive a personal reply from me or one of the unit board or committee members than a mechanical failure notice from the "mailer daemon".

That kind of service attitude may or may not be practical or appropriate for your groups, but it is a alternative to consider.

Shal


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