SPF shouldn't need to deal with this... but I guess adding a NXDOMAIN rule
couldn't hurt.
I know Sendmail (probably many others) already have the ability to reject email
if the domain name does not exist.
Specifically for sendmail remove/comment this from your mc file then rebuild
your cf file
FEATURE(`accept_unresolvable_domains')dnl
Now if I could only get an "enable_spf" feature =P
----- Original Message -----
From: "Marc Alaia" <marc(_at_)alaia(_dot_)net>
To: <spf-discuss(_at_)v2(_dot_)listbox(_dot_)com>
Sent: Tuesday, February 03, 2004 5:51 PM
Subject: [spf-discuss] NXDOMAIN
Is there a way to differentiate between a domain not having a TXT record and
not existing at all?
For example, if an email comes in that is from user(_at_)example(_dot_)com,
but
example.com does not exist or does not make sense (I just got 5 messages
from "UEXSVBPD(_at_)eager farmington current paper controversy nostradamus
eastern demon aug mckenna berra shipmate thunderstorm microbial credential
counterfeit trapezoidal coerce" as reported by my SPF Proxy log). To me,
this is about the same as an explicit SPF Fail. If the domain is not
registered, then the email cannot come from that domain!
Since SPF does not address this scenario (right?), couldn't spammers just
use non-existant domains?
Marc
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