2. Forwarding is a service provided to recipients in which the forwarding
domain agrees to deliver messages addressed to one mailbox to another
mailbox.
The forwarding case is where the hand-waving comes in. Sender-rewriting
is
undesirable here. It means that the intermediary recipient is essentially
forced to present themselves as accountable for a message that they have
no
connection to. It also present a heavy burden on many users who use
something like pobox.com or ieee.org to forward to an ISP account where
they
have no control over any whitelisting.
I'm not sure from which point of view you judge sender-rewriting
undesirable. It's simply not true that the forwarder has "no connection to"
the messages they forward. The forwarder is not part of, or contracted
with, the recipent ISP, they're as responsible for the messages they submit
as is any other external system. I guess there is added burden for some of
the players here, but they're at liberty not to implement, and suffer some
degradation to their service. This would be an issue for a user who choses
to use a forwarder in an unfriendly environment, and a cost issue for the
forwarder.
I don't see how it's really fair that I should be able to provide services
(and make a profit) in the middle, without taking on some responsibilities
there also.
--
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