It was the second.  I personally don't have time to hunt through decade old 
email archives.  That argument was made, but didn't carry the day.

Scott K

On October 4, 2017 2:15:02 AM EDT, Rick van Rein <[email protected]> wrote:
>Hello,
>
>Thanks to Scott for his feedback:
>
>> Making DKIM signing MIME aware was specifically rejected during DKIM
>> development due to implementation complexity.
>
>I'm afraid I wasn't there, but would like to learn from the past.  Any
>references are welcome.
>
>
>But what exactly do you mean by "implementation complexity"?
>
> - the need to incorporate MIME-knowledge into an MTA (which one might
>argue is not new -- but it is now a requirement for the signing and
>verifying MTA, which may have gotten by without until now)
>
> - the added complexity during signing and verification (I would agree;
>but argue that this reflects the complexity of the mail system, and
>ends
>there; it will not grow without bounds)
>
> - the need for two passes during verification (I am working on that;
>recognising an initial bit of text may be better than a rolling
>checksum
>over the entire text)
>
> - ...?
>
>I think the most important advantage of Lenient DKIM is that it avoids
>that a choice made in one place invalidates existing, constructive
>things taking place elsewhere.  ARC will not solve that discrepancy; it
>imposes one administrator's choice onto others.  To me, that is the
>most
>dire form of complexity (and a reason why people may hold back on
>deploying DKIM; look at this email for example, probably being
>rewritten
>to UTF-8 and thereby invalidating my DKIM-Signature made with dkimpy).
>
>
>Anywhere I repeat things already said, please feel free to point me
>back
>to discussions I've missed.
>
>
>Thanks,
> -Rick

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