On Sun, Mar 30, 2025, 8:33 p.m. Michael Thomas <m...@mtcc.com> wrote:
> > On 3/30/25 5:21 PM, John Levine wrote: > > It appears that Michael Thomas <m...@mtcc.com> <m...@mtcc.com> said: > > I seem to recall previous discussions have suggested that the "v" tag > shouldn't have been included in the first place; if things are so > different that you need to change the version, you may as well change > the name of the header field altogether. > > > Seems like six of one, half dozen of the other. The version change sort > of signals that it has a backward incompatible change, but everything > else will be the same. ... > > The obvious reason to have a new header is that there's a new tag that the > evaluator has to understand. You can't do that in a backward compatible way. > > It doesn't "need" to understand it, any more than any new extension "needs > to be understood". Deployments are completely at liberty to ignore any > soi-disant "DKIM2" regardless of whether it's a new header or an upgrade to > DKIM. The authors can want it to be deployed all they want, but it's not up > to them. > > I tried a couple of ways to kludge that in for my conditional chained > signature draft, none very satisfactory: > https://datatracker.ietf.org/doc/draft-levine-dkim-conditional/ > > Does this run on the assumption that DKIM isn't a trace header? I keep > asking and nobody will answer. Two different working groups, two different > bouts of silence. > I know of systems that don't add DKIM signatures for messages passing through them, and systems that remove existing DKIM signatures from messages prior to passing them along. I'm not aware of any that reorder signatures or don't place their signatures at the top of the header, but I don't know for sure that any of the data I have access to would make such a distinction. Mike > _______________________________________________ > Ietf-dkim mailing list -- ietf-dkim@ietf.org > To unsubscribe send an email to ietf-dkim-le...@ietf.org >
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