I did read that before I replied.  I just read it again.  I don't see where it 
specifies which fields should be DKIM signed.  Did I miss it?

Scott K



On October 8, 2021 3:58:16 PM UTC, Dave Crocker <[email protected]> wrote:
>On 10/8/2021 8:41 AM, Scott Kitterman wrote:
>> It's not clear to me which you mean by author's domain?  Are you suggesting
>> that the email originator include both Author and From and DKIM sign Author
>> instead of From?
>
>Yes he is.  Please see:
>
>    Email Author Header Field
>
>    https://datatracker.ietf.org/doc/rfc9057/
>
>>     Abstract
>>
>>         Internet mail defines the From: header field to indicate the author
>>         of the message's content and the Sender: field to indicate who
>>         initially handled the message on the author's behalf.  The Sender:
>>         field is optional if it has the same information as the From: field.
>>         This was not a problem until development of stringent protections on
>>         use of the From: field.  It has prompted Mediators, such as mailing
>>         lists, to modify the From: field to circumvent mail rejection caused
>>         by those protections.  In effect, the From: field has become
>>         dominated by its role as a handling identifier.
>>
>>         The current specification augments the altered use of the From: field
>>         by specifying the Author: field, which ensures identification of the
>>         original author of the message and is not subject to modification by
>>         Mediators.  This document is published as an Experimental RFC to
>>         assess community interest, functional efficacy, and technical
>>         adequacy.
>
>d/
>

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