Hi janet,
I see your point. A valid approach. To create the group-target in a mailinglist
I really hoped to a more straight forward approach direct in server.
In this approach the group-target it will be managed in the mailing list and should be changed manually not on server as a group. I don't remember a way to sync a mailinglist with a group in SME
The idea is that I need anyway that the group to be created on the server. Doing this will not impede nobody to just write on group ( if I'll set Visible=internal - only internal addresses but this is also against will ) . This is what I'm trying to avoid.
If it will exist at least something to just block all emails to the group. And then double the work to maintain the external list
I've found an approach on old version
https://forums.contribs.org/index.php?topic=34667.msg150339#msg150339