Meng Weng Wong <mengwong(_at_)dumbo(_dot_)pobox(_dot_)com> writes:
The pobox.com customer complains to HP and to Pobox.com saying because
of SPF he's not getting mail.
Tally:
ISP # of complaints
--------------------------
ipns.com 1
hp.com 1
pobox.com 2
Scenario 1:
IPNS says, oh, sorry, we'll stop publishing SPF.
HP says, oh, sorry, we'll stop doing SPF checks.
Pobox says, thanks, guys, how nice of you.
Scenario 2:
IPNS says, sorry, we have to do this to protect our name.
HP says, sorry, we have to do this because spam sucks.
Pobox says, I guess we just have to deal.
Which scenario is more likely?
There's also scenario 3, where HP whitelists pobox.com, allowing this
kind of forwarding from any IP that forward and back DNS verifies as a
subdomain of pobox.com. We could even create DNS-based whitelists
that reject forwarded mail from a domain unless it shows up in such a
whitelist.
Quick note: I think that SPF also breaks /etc/aliases mailing lists
as well. Are people who have simple lists like this also going to
have to move to something larger with sender-address rewriting?
Now the question is, how will pobox deal: with sender rewriting or
something else? And if it's something else, we need to come up with it
fast.
Would something like a identd for mail work? When a mail is received,
you connect to the DNS-identified server of the sender, submit a
messageid and a sender, and get a response as to whether that message
id was sent by that sender?
--
Ted Cabeen http://www.pobox.com/~secabeen
ted(_at_)impulse(_dot_)net
Check Website or Keyserver for PGP/GPG Key BA0349D2
secabeen(_at_)pobox(_dot_)com
"I have taken all knowledge to be my province." -F. Bacon
secabeen(_at_)cabeen(_dot_)org
"Human kind cannot bear very much reality."-T.S.Eliot
cabeen(_at_)netcom(_dot_)com
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