M-x spook still works on some versions of emacs (the default mac one anyway). It was designed to throw off email surveillance, dated terms though. More detail

M-x spook still works on some versions of emacs (the default mac one anyway). It was designed to throw off email surveillance, dated terms though. More details here: https://www.gnu.org/software/emacs/manual/html_node/emacs/Mail-Amusements.html https://www.gnu.org/software/emacs/manual/html_node/emacs/Ma...