On Tue, 30 Nov 2004, Alex van den Bogaerdt wrote:
There's no reason at all why MTA b would relay messages at all. The only
"relay" functionality would be a 'reverse forward' so that bounces going
to b(_at_)b will be forward to a(_at_)a, not to c(_at_)c(_dot_)
It can't correlate the bounces with original messages (and thereby send it
to the right place) without putting some kind of cookie in the return
path.
Traditional source routing (as suggested by John Levine) cannot be made to
work.
Tony.
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