Alessandro Vesely writes:
That's exactly the point. The forwarder violates SPF by impersonating someone else. The forwarded message carries no evidence whatsoever that the original message was SPF-compliant, does it?
Mail forwarding is not a random event. Mail forwarding occurs, presumably, at the ultimate recipient's request. It is the ultimate recipient that places the forwarding in place, so that the recipient's mail gets forwarded to a different destination.
As such, since the whole process is under the complete control of the recipient, the recipient must then recognize that SPF will not be functional on forwarded mail. The recipient must concede to disabling SPF as the cost of having the recipient's mail forwarded. SPF can still be checked, of course, by the forwarder.
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