I don't understand what "demeaning a domain's policy" means. On Fri, May 28, 2021 at 10:20 AM Alessandro Vesely <ves...@tana.it> wrote:
> On Fri 28/May/2021 17:43:37 +0200 Todd Herr wrote: > > > > Consensus on Ticket #47 <https://trac.ietf.org/trac/dmarc/ticket/47> > (Removal > > of "pct" tag) was reached during the May 27 DMARC Interim to keep the > tag, but > > to rewrite its definition in whole or in part to make its usage better > understood. > > > I think the text in RFC 7489 is quite good. Perhaps a word could be added > for > pct=0; for example: > > OLD > pct: (plain-text integer between 0 and 100, inclusive; OPTIONAL; > default is 100). Percentage of messages from the Domain Owner's > mail stream to which the DMARC policy is to be applied. However, > this MUST NOT be applied to the DMARC-generated reports, all of > which must be sent and received unhindered. The purpose of the > "pct" tag is to allow Domain Owners to enact a slow rollout > enforcement of the DMARC mechanism. The prospect of "all or > nothing" is recognized as preventing many organizations from > experimenting with strong authentication-based mechanisms. See > Section 6.6.4 for details. Note that random selection based on > this percentage, such as the following pseudocode, is adequate: > > if (random mod 100) < pct then > selected = true > else > selected = false > > NEW > pct: (plain-text integer between 0 and 100, inclusive; OPTIONAL; > default is 100). Percentage of messages from the Domain Owner's > mail stream to which the DMARC policy is to be applied. However, > this MUST NOT be applied to any other use, such as skipping DMARC > reports or demeaning a domain's policy. The purpose of the > "pct" tag is to allow Domain Owners to enact a slow rollout > enforcement of the DMARC mechanism. Using this tag, organizations > can experiment with strong authentication-based mechanisms while > lowering or even voiding the risk of non-delivery. See Section > 6.6.4 > for details. Note that random selection based on this percentage, > such as the following pseudocode, is adequate: > > if (random mod 100) < pct then > selected = true > else > selected = false > > jm2c > Ale > -- > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > dmarc mailing list > dmarc@ietf.org > https://www.ietf.org/mailman/listinfo/dmarc >
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