Bridging and Gateways
There is a fundraiser (money managed by the XSF, the project and developers aren't related though) to add history support to the Matrix/XMPP bridge Bifrost, check it out, and possibly throw them a few bucks if you're frequently bridging to Matrix rooms!
Bridging and Gateways
!bridging@community.xmpp.net
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Using XMPP in combination with other legacy networks.