Comment by dragonwriter

In context, that was implicitly "any previous US Secretary of State", not "any human being on Earth".

And I think the OIG report expressly said that Clinton was the only one to have done so.

OTOH, one could argue that a third party non-government, non-sanctioned, email system that the official does not control is potentially worse in many ways than a personal email server, as in the latter case the official at least in principal had control of retention and access and other aspects of the behavior of the system.