This one was hiding in plain sight too.
Via National Review:
A previously unknown e-mail address used by Huma Abedin was discovered on Thursday, just hours before the top Hillary Clinton aide prepares to testify in front of the House Select Committee on Benghazi.
Conservative watchdog group Citizens United discovered the address in an e-mail exchange that shows Clinton Foundation CEO Robert Harrison forwarding a speaking invitation for then-Secretary of State Clinton to both Abedin’s State Department account and an unfamiliar Abedin address on November 6, 2012.