I wonder to what extent he's actually correct that end-to-end & reputation really aren't compatible. After all, if one ignores forwarding for a moment then a s

I wonder to what extent he's actually correct that end-to-end & reputation really aren't compatible. After all, if one ignores forwarding for a moment then a server will always know the peer who is sending it email, and if it knows that peer then it can calculate reputation for it (it can know the total emails it has received from that peer, and the number reported by users as spam). The problem then becomes one of making it more expensive to create a new peer, which I think is doable.