He would know that she was not using a state.gov or at least a ".gov" domain name and what is a private domain name. Of course, he would not know the location

He would know that she was not using a state.gov or at least a ".gov" domain name and what is a private domain name. Of course, he would not know the location per-se, but he should have alerted the appropriate authorities to put a stop to her use of a non-secure email for government business. The use of government servers not only are for security to prevent hacking but also in order to keep an official government record of all government business. This official record can then be made public through Freedom of Information Act (FOIA) requests. Obama would know this.