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Re: [dmarc-ietf] Ratchets - Disallow PCT 1-99

Dave Crocker <dcrocker@gmail.com> Tue, 20 July 2021 21:22 UTC

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From: Dave Crocker <dcrocker@gmail.com>
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Date: Tue, 20 Jul 2021 14:22:41 -0700
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Subject: Re: [dmarc-ietf] Ratchets - Disallow PCT 1-99
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On 7/20/2021 1:13 PM, Barry Leiba wrote:
> One of the points of "deprecation" is that we don't eliminate it
> entirely, but say that it's no longer used.  New implementations no
> longer generate it, but implementations that are interested in
> backward compatibility will still include support for it on receipt.
>
> Eventually, when we see that its use is rare enough, the community
> might move to no longer include suppor

This is a natural, and considerate, model.  In the Internet, I believe 
it also has been shown not to work.  Really.

If something is to be removed from a protocol, it needs to be removed.  
So, remove it.

If there is a concern about noting the removal, add an appendix that 
references the removed feature, explaining why it was removed, and 
citing the previous specification.

Do NOT make it 'deprecated'. Don't continue it's specification. Do NOT 
make its use optional.  Make its use a matter of private choice, beyond 
the four walls of the public protocol specification.

"Deprecated" makes things complicated and conditional.  Neither of those 
are protocol attributes to aspire to.

d/

-- 
Dave Crocker
dcrocker@gmail.com
408.329.0791

Volunteer, Silicon Valley Chapter
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