On Thu 23/Feb/2023 21:17:09 +0100 Scott Kitterman wrote:
If the consensus is that dropping pct requires a version bump, then I think the
correct solution is to not bump the version and add pct back to the
specification.
I think the consensus is to not bump version.
Yet, it's true that the new I-D breaks pct=. It is still mentioned in Appendix
7, but it's not specified. I wish for a more gradual change. The tag should
be handled by verifiers but not set in new DMARC records.
When I'll upgrade my DMARC software, I'll add handling of t= but won't remove
that of pct=, not until it disappears from DNSes.
The inaccuracy of pct= is documented here:
https://en.wikipedia.org/wiki/Bernoulli_sampling
Best
Ale
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