> Date: Wed, 30 Apr 2008 15:12:34 -0700
> From: [EMAIL PROTECTED]
> To: [EMAIL PROTECTED]
> CC: ietf-dkim@mipassoc.org
> Subject: Re: [ietf-dkim] forward movement, please? (was RE: Are lookalike
> domains like parent domains?)
>
>
>
> Arvel Hathcock wrote:
> > I propose that the side advocating removal of the NXDOMAIN check agree
> > to language which makes this step AT LEAST a SHOULD and preferably a MUST.
>
>
> Having the ADSP specification include normative text that calls for
> validating
> the From field domain name does two things:
>
> 1. Couples an entirely separate and more generally useful mechanism (checking
> domain name validity) to one that is considerably more limited (ADSP).
For reasons I have shared before I have to disagree. The check for domain
existence is not unrelated. In short the check for domain existence tells you
whether something is a D about which it is valid to search for a P. The fact
that people may already be doing this elsewhere and that it is useful for other
reasons doesn't have any impact on the fact that this check gives you a hard
algorithmic boundary for what entitiies ADSP is intended to apply to. We have a
specification that is currently intended to cover a narrow and well defined set
of entities, that is domains, and a check to tell whether a given entity is
such a thing.
>
> 2. Modifies SMTP. (Yes, really.)
As I think has been pointed out before here is the definition of the domain
portion of addr-spec from rfc2822.
"The domain portion identifies the point to which the mail is delivered. In
the dot-atom form, this is interpreted as an Internet domain name (either a
host name or a mail exchanger name) as described in [STD3, STD13, STD14]."
Wouldn't something have to exist to meet this specification? Or does the term
Internet domain include things that don't exist but maybe could?
>
> Having non-normative text that describes it serves to promote the idea but
> not
> couple it with the fate of ADSP.
>
> d/
> --
>
> Dave Crocker
> Brandenburg InternetWorking
> bbiw.net
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