Charlotte,
If you want all emails to go to the sender only, go to Admin, Settings, scroll down to Message Policies. "Reply to" has a dropdown menu.
Be sure to click on Update Group at the foot of the page.
If you only want occasional emails tot go to the sender only, you can use the email footer in an email to Reply to Sender. Or from the group homepage, click to reply and then click Private (bottom right side).
Frances
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/g/GroupManagersForum/wiki
/static/helpMore help: use the search button at the top of the Messages list.