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Re: [dmarc-ietf] "psd=" tag early assignment

John R Levine <johnl@taugh.com> Fri, 08 July 2022 20:07 UTC

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Date: Fri, 08 Jul 2022 16:07:09 -0400
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From: John R Levine <johnl@taugh.com>
To: Alessandro Vesely <vesely@tana.it>, dmarc@ietf.org
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Subject: Re: [dmarc-ietf] "psd=" tag early assignment
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>> The description of the tree walk should be clear enough.
>
> Yeah, /should/!  The very fact that you yourself changed your mind about how 
> it works, without going into the hassle of explaining your reasoning, ...

Um, what?  Scott and I went through some rounds of debugging to be sure 
the tree walk handled some obscure edge cases in a reasonable way.  It was 
all on this very mailing list with examples.  I think what we have now is 
OK but if you find something in the tree walk that is unclear or gets an 
unreasonable result, let us know, preferably with a concrete example.

Having done that, I remind everyone for the umpteenth time that that the 
overwhelming majority of DMARC publishers and DMARC lookups will not see 
even one psd tag, much less more than one.  While I could sort of see the 
use of an appendix describing the normal sorts of DMARC records that real 
mail operators are likely to publish and evaluate, I cannot see any 
benefit in wasting yet more time on arcane PSD edge cases.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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