E-MAIL THIS LINK
To: 

Obama used a pseudonym in emails with Clinton, FBI documents reveal
[Politico] Words fail.

Mentioned here repeatedly; as his Secretary of State, she had to be communicating with POTUS in some manner. If she had no active classified email accounts, that sort of narrows the available options. He's in it up to his neck and people within the inner circle and WH Communications Detachment are fully aware.
Posted by: Blossom Unains5562 2016-09-24
http://www.rantburg.com/poparticle.php?ID=468405