[ietf-dkim] Section 3.1 - ASP Usage

[Wietse Venema]

SM:
> At 16:27 29-04-2008, Douglas Otis wrote:
> >Do you think there should be a statement indicating the ADSP lookup
> >procedure should not be done when there is a valid Author Domain
> >signature?  Perhaps the receiving domain only validates DKIM
> >signatures when ADSP indicates Discardable. : )
> 
> My question is about the implementation of ssp-03.  The example which 
> was tested is an odd case as we have a dkim=pass and 
> dkim-asp=fail.  Section 3.1 of the draft says:
> 
>      If a message has a Valid Signature from an Author Domain, ASP
>      provides no benefit relative to that domain since the message is
>      already known to be compliant with any possible ASP for that
>      domain.
> 
> I read that as meaning that as the ASP (ADSP) lookup is not done 
> then.  I'm not saying that it should not be done. :-)

I wrote the predecessor of that text. The reader has to understand
that ADSP targets email without valid author domain signature. If
a message has a valid author domain signature, then the signature
speaks for itself, and ADSP is not needed.

	Wietse