https://tools.ietf.org/html/rfc4870#section-3.3
Many thanks for citing DomainKeys. I'd completely forgotten that it
specified essentially the same as I am proposing:
3.1 <https://tools.ietf.org/html/rfc4870#section-3.1>.
Determining the Sending Address of an Email
...
In the first instance, the most visible address is clearly theRFC
<https://tools.ietf.org/html/rfc2822>
2822 <https://tools.ietf.org/html/rfc2822> "From:" address [RFC2822
<https://tools.ietf.org/html/rfc2822>]. Therefore, a conforming email MUST
contain a single "From:" header from which an email address with a
domain name can be extracted.
A conforming email MAY contain a singleRFC 2822
<https://tools.ietf.org/html/rfc2822> "Sender:" header
from which an email address with a domain name can be extracted.
If the email has a valid "From:" and a valid "Sender:" header, then
the signer MUST use the sending address in the "Sender:" header.
If the email has a valid "From:" and no "Sender:" header, then the
signer MUST use the first sending address in the "From:" header.
and it did not change with DKIM followed up:
DKIM eliminated use of the 822.sender field.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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