Dark Mail turned out to be a joke. Apart from the silly fields like "political party", the fundamental security model's broken. It has essentially zero benefits of "just use Gmail". The suggested security level delegates security to the receiver's mail server. Basically if we just had a " require TLS with verified cert for SMTP" option, that'd do most of what Dark Mail does.

In fact, big companies already so this. When LM talks to the DOD over SMTP, you can bet they have mandatory TLS. Exchange offers this out of the box.

DM offers higher capabilities with no usability benefits over PGP or whatever.

Disclaimer: Since the beginning, I've said the DMA had a zero chance of success. The problem isn't solvable.