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

Dotzero <dotzero@gmail.com> Tue, 20 July 2021 21:04 UTC

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From: Dotzero <dotzero@gmail.com>
Date: Tue, 20 Jul 2021 17:04:20 -0400
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To: Barry Leiba <barryleiba@computer.org>
Cc: Benny Pedersen <me@junc.eu>, IETF DMARC WG <dmarc@ietf.org>
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Subject: Re: [dmarc-ietf] Ratchets - Disallow PCT 1-99
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On Tue, Jul 20, 2021 at 4:13 PM Barry Leiba <barryleiba@computer.org> 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 support (no longer needing backward
> compatibility).  But I expect that support on receipt would remain for
> some time.
>
> Barry
>

As soon as we say deprecated, the justifications for backwards
compatibility become tenuous. If a sender has no reasonable expectation
that most validators will respect their request, why would they make such a
request (other than in ignorance). I think very few would argue that using
percent is a long term strategy for any given domain. Either percent is
useful or it is not.

Michael Hammer

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