change the group settings to web only view and web only post.
and not have your group as an email group.
they can still copy and paste the message to an email..
but that can be the copy write bad thing.
make sure you have it in words or writing in your groups rules page.
same on photo's as well you can water mark them to not reproduce.
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Thanks Paul in Iowa
see my groups at?
iowagold2020