On Mon, Dec 12, 2022 at 12:36 PM Michael Thomas <[email protected]> wrote:
> I have good reason to be suspicious. That Google was one of the major > proponents of ARC which was supposedly to deal with the mailing list > problem but all boiled down to reputation that could already be done with > plain old DKIM suggests that reputation remains an unsolved problem. Maybe > it is just one side of the company not knowing what the other side knows, > but I find that rather unlikely. So there is a contradiction somewhere > here from where I sit. > I would be unsurprised if the consensus is indeed that reputation is an unsolved problem. There's no DKIM-based public reputation service that I know of; it remains the secret sauce of large operators with the resources to gather enough data to compute such a thing, and they have little incentive to share. I did enough experimentation years ago to conclude that such a thing would be possible to build, but the need for reliable data sources and the upkeep effort were both significant. -MSK
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