Chris Lewis writes:
Tony Finch wrote:
On Thu, 25 Jan 2007, Martin Hannigan wrote:
By tracking the historical behavoir of /32's or larger allocations, we
could develop a profile of the behaviors that will eventually establish
a baseline for those allocations as "good" "nuetral" or "bad", to keep
it kind of simple. A lot of this data is already out there.
Yes, blacklists do this already, though they are binary not ternary.
That's not necessarily true. Many DNSBLs are already multi-valued
(zen.spamhaus.org presently has 6 independent "flags"), and they can be
constructed to be more sophisticated with as many as 2^24 values on a
single return, and/or being used in scoring. It's simply a matter of
deciding on the convention, publishing it, and having admins configure
to the intended interpretation (or not :-(.
Yes -- in fact, IronPort's SenderBase at one point used TXT records,
containing a complex encoding of many attributes and ratings.
(Maybe they still do.)
A few of the commercial anti-spam vendors call this kind of thing
a "reputation service".
--j.
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