I have a data point. When we (Google) did an experiment/analysis of this a couple of years ago the conclusion was a) multi-value From are relatively rare and mostly look like abuse or mistakes rather than intentional. b) Users generally don't care about those messages if they end up in spam.
So... Is the volume measurable? - yes but very small Are there legitimate emails? - yes but users don't seem to care about these messages Based on the data I have, I would be in favor of an update that essentially makes multivalued From Invalid rather than a corner case that needs to be handled. /E On Thu, Jan 18, 2024 at 12:41 AM Steven M Jones <[email protected]> wrote: > On 1/17/24 2:56 AM, Alessandro Vesely wrote: > > [ Discussion of what to do with multi-valued From: in messages ] > > > > However, since DMARC bears the blame of banning multi-valued From:, it > > is appropriate for it to say something about the consequences and > > possible workarounds. > > DMARC doesn't ban multi-valued From:, but the language of section 6.6.1 > is confusing because we were documenting the practice of implementers up > to that time as much as being prescriptive. If anything, it highlights > the need for the clearer language that Todd quoted earlier in this thread. > > Has a measurable volume of legitimate messages with multi-valued From: > headers been reported in the wild? Is there a real-world problem that > needs to be solved? > > --Steve. > > > _______________________________________________ > dmarc mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/dmarc >
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