(just to defend myself of why I heard of this): it was used by General Patraeus during his affair with his biographer. "The former CIA director used a trick of

(just to defend myself of why I heard of this): it was used by General Patraeus during his affair with his biographer. "The former CIA director used a trick often used by terrorists and teenagers to make e-mails harder to trace, the Associated Press reports." https://www.cnet.com/tech/services-and-software/petraeus-reportedly-used-draft-e-mails-to-converse-with-mistress/ https://www.cnet.com/tech/services-and-software/petraeus-rep...