@halva i also just learned more from their site and since they advocate using specific chatmail servers and not standard email that seems very easy to block and then we're back to square one anyway

@hipsterelectron @halva Also, from their FAQ:

"E-Mail servers do not get access to this protected metadata but they do see the message date as well as the message size, and, more importantly, the sender and receiver addresses."

So basically authorities can build a graph of your contacts and how often you're talking to them, which is one of the things Signal aims to protect against with Sealed Sender:

Technology preview: Sealed sender for Signal

In addition to the end-to-end encryption that protects every Signal message, the Signal service is designed to minimize the data that is retained about Signal users. By design, it does not store a record of your contacts, social graph, conversation list, location, user avatar, user profile name, ...

Signal Messenger (signal.org)

@mathew @halva i'm working on extending sealed sender to the recipient as well which is the one thing signal can't do bc they need that for message routing. my work just takes the stuff that signal does on the server and instead sends it as p2p messages. the prototype that acts like gpg works now and i should probably just ship that as v1 i was trying to solve everything at once lol