@hipsterelectron @halva This research project from some years back might be of interest:
https://www.sciencedirect.com/science/article/abs/pii/S1569190X10002042
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A forum for discussing and organizing recreational softball and baseball games and leagues in the greater Halifax area.
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@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 -
@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)