DMTP/DMAP https://en.wikipedia.org/wiki/Dark_Mail_Alliance https://en.wikipedia.org/wiki/Dark_Mail_Alliance The stuff Ladar Levinson created after the Lavabit

DMTP/DMAP https://en.wikipedia.org/wiki/Dark_Mail_Alliance https://en.wikipedia.org/wiki/Dark_Mail_Alliance The stuff Ladar Levinson created after the Lavabit takedown, (famed for begin Snowden's email provider). Although I'm not just talking about email protocols; but additions or other improvements that always have the same problems (PGP encrypted email, or whatever Facebook tried to do when they reinvented email...)