Server A also sends messages coming from servers it federates with, so those on server C can see server B's messages, but C'ers just can't reply to them and expect B'ers to actually receive those messages.
Wouldn't A also forward those replies to B?
Server A also sends messages coming from servers it federates with, so those on server C can see server B's messages, but C'ers just can't reply to them and expect B'ers to actually receive those messages.