You can provide Send Rich Email with a collection of Email addresses, but how do you get that information out of a Public Group? This new GetGroupInfo Flow action takes a group name or Id and returns a list of information about the Users in that group (and in any of the child groups that are in that group).
One of the return values is a collection of email addresses that can be handed straight to Send Rich Email.
Returned information includes:
Version 1.0 Unmanaged 6-15-20