The problem I have with leaving pct=0 in as the only (non-default) value is that it locks history into the protocol. It makes no sense to have a binary situation specified by a tag called “pct” that is either 0 or 100.
If we’re leaving this in as a binary thing, (1) we’re already incompatible with deployments that do pct=20 or whatever, so (2) we might better make it a y/n or t/f valued tag for that function, deprecate pct entirely, and leave text in a backward-compatibility section explaining what happened. I just think that the pct= 0 or 100 thing won’t wear well and will appear tattered quickly. Barry On Tue, Aug 3, 2021 at 8:08 AM Todd Herr <todd.herr= [email protected]> wrote: > On Mon, Aug 2, 2021 at 10:10 PM John Levine <[email protected]> wrote: > >> It appears that Todd Herr <[email protected]> said: >> >> I like simple, but I also like the idea of a separate section that >> >discusses the history of the pct tag and why the old values won't work >> any >> >longer. >> >> OK except: >> >> > remains the default, and "0". The value of "0" took on unintended >> > significance during the experimental stage as a value used by some >> > intermediaries and mailbox providers as an indicator to either >> > deviate from standard handling of the message and/or to alter the >> > substance of reports generated, ... >> >> Alter the reports? Huh? I was under the impression that the policy >> didn't >> affect the reports, much less the pct. >> >> > My apologies... > > My memory of the effect of the policy "p=quarantine; pct=0" vis-a-vis how > Google handles a domain's mail was faulty. I remember when working to > implement DMARC at $JOB[-1] for our corporate domain, I was seeing data in > the agg reports from Google when we were at p=none that led me to ask "WTF > are those hosts?" and digging around the various corners of the internet > unearthed the unknown at the time to me fix of "Yeah, you gotta be at > p=quarantine; pct=0" to get reports from Google that make sense. > > There are several years old threads on mailop that speak to this topic, > with outsiders asserting that what is in fact happening is Google Groups is > rewriting the From when it's p=quarantine; pct=0, and Brandon Long from > Google in the thread doesn't challenge that assertion, so I'll remove > reference to the reporting alteration. > > -- > > *Todd Herr* | Technical Director, Standards and Ecosystem > *e:* [email protected] > *m:* 703.220.4153 > > This email and all data transmitted with it contains confidential and/or > proprietary information intended solely for the use of individual(s) > authorized to receive it. If you are not an intended and authorized > recipient you are hereby notified of any use, disclosure, copying or > distribution of the information included in this transmission is prohibited > and may be unlawful. Please immediately notify the sender by replying to > this email and then delete it from your system. > _______________________________________________ > dmarc mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/dmarc >
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