On Mon, Jun 6, 2022 at 3:49 PM Olivier Hureau <
olivier.hur...@univ-grenoble-alpes.fr> wrote:

>
>  > dmarc-fo = "fo" *WSP "=" *WSP ( "0" / "1" / ( "d" / "s" / "d:s" /
> "s:d" ) )
>
> What about domain owner that have a value that is not listed there ? ex:
> "1:d" or even "1:d:s" ? (4.59% of explicit fo tags, from my measurements)
>
>
> Even though RFC 7489 allowed them, values such as "1:d" (generate a
failure report if any auth mechanism failed or if DKIM failed) or "1:d:s"
(any, dkim, spf) make no sense, because 1 implies d and s.

I'd rather see the description of the "fo" tag cleaned up to stress this.



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*Todd Herr * | Technical Director, Standards and Ecosystem
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