Use of a personal account isn't prohibited but any govt business emails on a private account are required to be forwarded to a govt account within 20 days. By owning her own server, there's no real accountability beyond forensic inspection of the disks. Plus its a safe bet that the half of the developed nations on earth hacked her server and read everything. It's is either intentional concealment, or complete lack of comprehension of 21st Century communications. The Clintons, Bushes, Romneys, et al, live in their own elitist bubbles and really have no concept of the world that the rest of us inhabit. I heard Lindsey Graham on MTP this morning say that he's never sent an email...and this guy is making laws about communications? Years ago, I spent some time doing business in that world and it was quite an experience.
I think in certain positions you might not be able to even use a personal account (especially to conduct official correspondence) or use private cell phones. (Recall the issues and Obama-drama with Obama "giving up his blackberry (remember them?")
Actually, I disagree with you, a bit, on this. I have zero problem with politicians, corporate heads, bankers, hollywood types, non-profit leaders, pastors, or whomever you might think are "in charge" of an organization not using email, twitter, smartphones, facebook, etc. In fact, not having people below you to "screen calls", as it were, is an impediment. Besides the security risks it also takes too much time if one deals with minutiae of every post, email, etc. They should be informed, of important things, but the ability to delegate responsibility and also have good people to filter out and report what is necessary, respond appropriately, is key especially these days. Sometimes The problem is 1) if you picked the wrong people and 2) if you don't use the right people and 3) when the civil service, or government, is too ingrained or becomes too large (or worse partisan.) Crazy as it sounds! Here is a libertarian, right-winger type to say there IS a reason for a certain level of government, and in business, bureaucracy in some areas!