Some years ago, I hosted my own matrix server for a few months. I’m an experienced self-hoster, but I remeber that Matrix was paticularly hard to host, requiring weird proxy rules, DNS adjustments, federation never worked reliably and push notifications never worked at all. I ditched the project soon because I also had no real use for it. However, I recently had some ideas where a Matrix server would be useful again. Has anyone attempted to install it recently and can tell me whether the situation has improved? Also, which server do you recommend? There still is synapse but I found it paticularly complicated to host. Dendrite is now archived and the current fork seems to be tuwunel which doesn’t seem to be under very active development.
“can’t guarantee the authenticity of this message” just means it was restored from backup. In the same vein, if you can decrypt a message in any client, it should upload the keys to the message backup so it can be decrypted on other clients, even ones that haven’t logged in.