On Wed, Jan 15, 2025 at 4:53 PM John Levine <[email protected]> wrote:

> It appears that Brotman, Alex <[email protected]> said:
> >Hello folks,
> >
> >Ale has submitted a PR that (sort of) re-opens a previous PR.  There
> wasn't a consensus last time, so hoping we can have some
> >discussion on this one.
> >
> >
> https://github.com/ietf-wg-dmarc/draft-ietf-dmarc-aggregate-reporting/pull/31
> >
> https://github.com/ietf-wg-dmarc/draft-ietf-dmarc-aggregate-reporting/pull/27
> >
> >There was more language in the first PR.  The first PR suggested that the
> report generator create a report when the policy change was
> >detected.  The second is a bit more terse, and changes the focus of the
> change.
> >
> >In 7489, we had:
> >
> >   Aggregate reports are most useful when they all cover a common time
> >   period.  By contrast, correlation of these reports from multiple
> >   generators when they cover incongruent time periods is difficult or
> >   impossible.  Report generators SHOULD, wherever possible, adhere to
> >   hour boundaries for the reporting period they are using.  For
> >   example, starting a per-day report at 00:00; starting per-hour
> >   reports at 00:00, 01:00, 02:00; etc.  Report generators using a
> >   24-hour report period are strongly encouraged to begin that period at
> >   00:00 UTC, regardless of local timezone or time of report production,
> >   in order to facilitate correlation.
> >
> >I could restore the language above (which I believe was John's
> suggestion).
>
> People have been sending aggregate reports for over a decade, so anyone who
> receives reports has already figured out how to handle the way they arrive
> now.
> I don't expect anyone to change their sending schedules so let's just
> leave it alone.
>
> The suggestion to try and sync reports when the policy changes is
> completely
> impractical for many reasons even if it were useful, which I do not think
> it
> would be, so I hope that's off the table.
>
> R's,
> John
>

+1

Michael Hammer
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