Once the group is created, set the following settings:
I think this option
Can be changed so that people can only reply to the threads they start themselves (?) (at least if you don’t accept anyone as members of your group?). That can be a nice feature for this use case.
With Google Workspace, you can use a custom address, to have say
. If you do that, before adjusting the settings for the Google Group, you need to adjust the settings for the Google Workspace so that all the above options show up in the settings in the first place; you can do that here:
