I think that the order of checking will be something like:
Is there an SPF record
Yes - Is the mail valid
No - Reject - stop
Yes - What is the senders reputation
Good - Accept - stop
Bad - Reject - stop
None - add X points and continue
No - continue
Does the message look spammy?
Yes - Reject
No - Accept
The 'reputation' here could include things like have I received valid email
from the domain before, have I sent email to the domain etc.
Rome was not built in a day, we have to deal with the Eddy Marin and Ralsky
spammers before we start to deal with the grey issues of borderline spam.
Chances of a hard-core spam genuinely coming from a domain I send to are
very small.
Phill
-----Original Message-----
From: Mark Anderson [mailto:mark(_at_)hivercon(_dot_)com]
Sent: Tuesday, February 03, 2004 7:46 PM
To: spf-discuss(_at_)v2(_dot_)listbox(_dot_)com
Subject: Re: [spf-discuss] NXDOMAIN
Marc,
Since SPF does not address this scenario (right?), couldn't
spammers just
use non-existant domains?
Any half decent filtering solution will check the return
address for MX
record - and might go so far as to check the MX host will accept email
for the email address in question.
Regards,
Mark Anderson.
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