It's the same tactic that former CIA Director David Petraeus used to send messages to his mistress. It's been around for a while, so investigators look for it.

It's the same tactic that former CIA Director David Petraeus used to send messages to his mistress. It's been around for a while, so investigators look for it. https://www.washingtonpost.com/news/worldviews/wp/2012/11/12/heres-the-e-mail-trick-petraeus-and-broadwell-used-to-communicate/ https://www.washingtonpost.com/news/worldviews/wp/2012/11/12...