From: Alex van den Bogaerdt (alexergens.op.het.net)
Date: Sat Jan 10 2004 - 19:27:51 CST

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On Sat, Jan 10, 2004 at 11:38:22PM +0200, Liviu Daia wrote:

> Well, like it or not, people have been using forwards for 20+ years.
> If you want to change that, you have to come up with a replacement that
> works, at the very least. At this point, that's a lot more than can be
> said about the proposed SRS.

I think there is similarity with IP tunneling here. People used to be
able to use foreign IP source addresses. Only the return packets needed
to be tunneled to the real destination[1]. This got abused on such a scale
that providers were urged to block foreign source addresses. When this
happened, tunneling needed to be done in both directions.

What if there were a similar approach taken to email. If mail needs
to be forwarded, put it in another envelope and resend. If this new
email is returned to sender, verify that it's not bogus, and bounce
the content of the outer envelope (which is the original email).

Please don't shoot at me for proposing something far from complete,
it is just that I'd like to know if this idea is too far fetched.

cheers,
Alex

[1] For those who don't know how this works:

Traveler "A" with home base "B" is contacting client "C".
"A" is sending out IP packets using an address from A network "B"
and is sending those to "C". "C" is sending packets "back" to "B"
which in turn forwards it to the real network where "A" is present.

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