> Any user on A can setup forwarding to any/many address/es of B and then send > SPAMs to A, which have to be unconditonally accepted on B? How hard will be > to run dedicated A without any SPAM filter for this purpose?
I am not saying that B should necessarily blindly trust A. But if a spammer on S sets up a forward on A to a victim at B, then I would say that the correct thing to do for B would be to block S (that is, any mail that originated from S, not necessarily delivered directly by S), not A. Of course that's no longer a simple iptables block now. Thanks, Kasper
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