[caf]

The "just send work email there" bit seems highly inaccurate. It seems pretty clear that the intention was for this server to be used for unclassified communication. You can't even send email from a classified to an unclassified network without clearly marking it as such.

Now clearly it is at best highly naive to think that a server handling the kind of volume of email that the Secretary of State would receive, much of it from people handling classified information, is going to be able to stay 100% free of classified contamination.