I seem to recall reading that their "foundation" is worth over a billion dollars? And what is their "foundation" about, anyway--from the outside, it looks like a money-laundering scheme.
Surely they had to know she was not using a State Department email. Thus far, though, every indication is that the White House did not know.
Maybe she set up her private server with a ".gov" domain name.
I know that on government email systems, you do not actually see the email address most of the time. Instead of the email address, you see a hyperlink containing the person's name and limited information (such as rank and organization). If she set up her private email correctly, that is all anyone would see. However, I do not know how she would get her private email address into an official address book so that people who have not already received email from her could send her email.
State Department IT guys had to be in on it.
Nope, it's a dot Com.