spf-discuss
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Re: Forwading/Redirecting: The problem as I see it....

2005-07-06 15:51:59
Stuart D. Gathman wrote:
 
1) the target checks SPF
2) the target reject SPF failures

Doing (1) without (2) is dangerous, if FAIL-mails end up in a
spam folder.  The user could still "somehow" extract the FAILs
caused by his own forwarding setup, but an organized approach
to "somehow" like VarA or per-user-white-lists would be more
reliable.

OTOH (1) plus (2) is okay, at least the sender then knows what
is going on, and can delete the address from his address book.

As a forwarder, you don't have to do anything unless one of
your targets starts doing 1, 2 and 3.

It's perfectly okay to do nothing at all, it's a 551-emulation.

251-forwarding was always meant as a temporary courtesy, not
as a permanent waste of bandwidth introducing more points of
failure for fun and for profit.

Those targets are wrong - they should not be rejecting when
they can't list forwarders.

IBTD.  Neither the forwarder nor the next hops are necessarily
"wrong", the only person in this game that has the complete
required knowledge to get it right is the receiver.  The user
has to arrange this "somehow", see above.

Maybe the admins offer one of the (simple) solutions.  Or they
don't:  bye bye SPF-mail, FAIL-users should know why they want
protected addresses.  TINSTAAFL, Frank