Re: [Asrg] Re: SPF abused by spammers

[Seth Breidbart <sethb at panix.com>]

Daniel Feenberg <feenberg at nber.org> wrote:

> I have another question - Even given that an ISP might not want to
> close port 25 outbound from its dynamic address customers at the
> router level, what advantage does SPF have over merely informing
> MAPS/Spamhaus, etc of its dialup ranges?

Suppose I own cluebytwelve.com (I do), and I want to send mail "from
sethb at cluebytwelve.com" from my home computer.  I can set up an SPF
record for cluebytwelve.com to specify that my current IP address has
that permission, completely independent of the ISP that provides
IP-level access.  That works well for me, even though the ISP doesn't
authorize my home machine to send directly email from "sethb at ISP".

Seth

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