My view is that there is no one solution to the 'forwarding problem'.
We need a suite of solutions that meets different needs. SRS is A solution,
not THE solution.
Forwarder whitelisting is definitely needed.
I'm not sure that trusted-forwarder.org should ever go away.
SES/BATV/SRS-0 in combinations with exists may be a solution.
Personally I published a -all record understanding that forwarded messages may
get rejected. When it happens (two messages in 2 1/2 years) I just resend
them.
I agree that this is an area we need to work on. One of the reasons I
recently started a separate Postfix policy daemon for SPF (see
http://www.openspf.org/Software - it's the Python one I'm talking about) is
that I want a vehicle to prototype forwarder whitelisting. I've got other
stuff I need to do with it before I get to that, but that's one of the things
on my list.
Scott K
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