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What's the retention period for Inbox messages?
(aussie.zone)
Discussion about the aussie.zone instance itself
I've seen some user profiles have a "message securely" button which I think uses an external messaging service, something along the lines of telegram but completely FOSS and possibly decentralised? OP- may be worth looking into that if you were asking this from a privacy angle
Yeah Matrix is a federated (but not ActivityPub) secure messaging service.