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Re: [Asrg] seeking comments on new RMX article

Dave Crocker <dhc@dcrocker.net> Sun, 04 May 2003 14:14 UTC

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From: Dave Crocker <dhc@dcrocker.net>
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To: Mike Rubel <asrg@mikerubel.org>
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Subject: Re: [Asrg] seeking comments on new RMX article
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Date: Sun, 04 May 2003 06:56:59 -0700
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Mike,

MR> I have written a new article to help explain RMX records, and would
MR> sincerely appreciate any feedback or comments you might have on it.  The
MR> article here can be found here:

The premise of the scheme is in the following text:

MR> Detecting a forgery begins by realizing that email systems never
MR> legitimately use third-party relays anymore.

What this therefore asserts is that the domain name in a From field is
always tied to a fixed set of originating MTAs.

The presumption is incorrect.

For a variety of reasons -- notably for some mobile users -- the
originating MTA may well be unable to know the set of valid domains
sending from it.  That is, some mobile users must be able to
spontaneously post through different MTAs.

This highlights an important requirement for evaluating proposals:  What
*valid* scenarios does it prevent?

d/
--
 Dave Crocker <mailto:dcrocker@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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