There is history delivery on first connect on Matrix whenever I set-up a new device.
I don't think XMPP has any future. It's a hassle to set-up and I have yet to see a really modern looking client. Blabber does not fit that at all.
I don't think XMPP has any future. It's a hassle to set-up and I have yet to see a really modern looking client. Blabber does not fit that at all.
Not for encrypted rooms.
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EDIT: XMPP has https://xmpp.org/extensions/xep-0313.html which can deliver history for the clients that support it. I just haven't set it up.