Alain Knaff wrote:
begin Monday 26 April 2004 15:38, Daniel Taylor quote:
For domains with users that legitimately use forwarding services that do
not generate a valid (local to the forwarder) envelope from, simply
set ?all or ~all in the SPF record.
Should it really the sender's responsibility to care about forwarding?
Usually, forwarding has been set up by the _receiver_, and the sender
often has no way of knowing that adresses that he sends to might be
forwarded.
My bag, I was thinking backwards on this paragraph. It would be the
receiver's responsibility here again.
Still, I don't think that SPF would lose its "moral authority" over
this, because these local policy exceptions for forwarder can only
make SPF more permissive, never more restrictive. That is, a mail
message might get accepted even though the sender said it shouldn't,
but never the other way round.
This was my ultimate point. SPF, as defined, only provides a set of
_recommendations_, which can be taken to the extent practicable
by all parties involved. If a fully strict SPF invocation would cause
you problems as either sender or receiver you can relax the rules
to reflect your needs.
--
Daniel Taylor VP Operations Vocal Laboratories, Inc.
dtaylor(_at_)vocalabs(_dot_)com http://www.vocalabs.com/
(952)941-6580x203