Since the post describes relying upon a single text file, and makes passing mention to the problem of email ... IIRC Jef Raskin's The Humane Interface, which e

Since the post describes relying upon a single text file, and makes passing mention to the problem of email ... IIRC Jef Raskin's The Humane Interface, which expounds in part on his Canon CAT features and philosophy, proposed [and/or "stole" w/o credit] integrated email within the editor hard-wired to a single file. https://en.wikipedia.org/wiki/The_Humane_Interface https://en.wikipedia.org/wiki/The_Humane_Interface https://archive.org/details/humaneinterfacen00rask https://archive.org/details/humaneinterfacen00rask