Earlier quoted context omitted.
Well, the specific law referenced here is a federal law which only applies to high ranking federal officials (e.g. Cabinet secretaries). It would apply to Clinton, but not to most of the people on your list. "The head of each Federal agency shall make and preserve records containing adequate and proper documentation of the organization, functions, policies, decisions, procedures, and essential transactions of the age…
> The only relevant question is, "are emails 'records'?" I don't know, I see other relevant questions. For instance, nothing in the quoted law says anything about how they shall "make and preserve" the records, only what purposes those records must be adequate to serve. So, using private email alone doesn't seem to be a violation, it seems to be something that might be the starting point for an inquiry as to whether…
In the corporate world, if there were a legal requirement for compliance, the auditor would verify that all work email is going over work servers, and then review the policies in place on those servers. You could technically let a special employee run their own server, but then that server would need to be audited, and the policies in place there reviewed. "Nah, you can trust Joe" wouldn't cut it.
Otherwise the entire point of compliance laws just goes out the window.