On Sun 06/Aug/2023 11:38:18 +0000 Tim Wicinski wrote:
On Sun, Aug 6, 2023 at 7:14 AM Alessandro Vesely <[email protected]> wrote:
On Sat 05/Aug/2023 22:24:28 +0000 Tim Wicinski wrote:
[...]
5.3. General Record Format
auth: (comma-separated plain-text list of dmarc-methods; OPTIONAL;
default is "spf,dkim")
Indicates the supported authentication methods. The order of the
list is not significant and
unknown methods are ignored. Possible values are as follows:
dkim: Authenticate with DKIM
spf: Authenticate with SPF
An empty list indicates the tag is ignored.
According to the grammar below, an empty list is a syntax error. I'd keep
the syntax as is and remove the line mentioning an empty list.
Good catch - but why not say "an empty list is a syntax error". That is
useful (to me, others may see it otherwise).
Yes, noting that may better readability. Since syntax errors MUST be
ignored, it conveys the same meaning as before, but the reason is clearer.
One last thing, how about directly assessing extensibility?
dmarc-method = %s"dkim" / %s"spf" / dmarc-value
Ignoring unknown methods is already in the text, so it wouldn't hurt. I
have no useful extension in mind, but, for DMARC-fiction examples, one
could think of "arc", "dnswl", "dkim-atps", ...
BTW, all literals in Section 5.4 miss those %s'.
Best
Ale
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