Re: [Asrg] Re: Why SPF? (was: Anti-spam laws do work, FYI. There's proof.)

[Dave Crocker <dhc at dcrocker.net>]

Jon,

JK> I don't believe that this assumption is as wierd as all that. Addresses
JK> *can* be considered (over some time period) bound to a set of IPs. As you
JK> intimate, there are issues are to do with (a) the size and shape of the IP
JK> set and (b) how it can change. SPF proponents will tell you that these
JK> issues are addressed.

Mapping from name to address to route is, of course, at the heart of the
Internet's modern architecture.

However the approach of authorizing an MTA by a message author make
information that is usually highly transient -- the hop-by-hop IP
address selection -- instead be highly fixed.

The set of mechanisms surrounding this approach have no precedent in
large scale networking operation.  Further, that set of mechanisms has
components that are wildly out of balance with the demands of the
service.


JK>  SPF proponents will tell you that these
JK> issues are addressed.

The interesting question is whether they have addressed them
sufficiently to produce a service that has both long-term utility and
long-term operational viability.

d/
--
 Dave Crocker <mailto:dcrocker at brandenburg.com>
 Brandenburg InternetWorking <http://www.brandenburg.com>
 Sunnyvale, CA  USA <tel:+1.408.246.8253>, <fax:+1.866.358.5301>


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