[dmarc-ietf] Re: Proposed Recharter to Conclude the ARC Experiment

["John R. Levine" <[e-mail]>]

On Tue, 3 Feb 2026, Jeroen Massar wrote:
> For obsoleting ARC. It would be good to have Google + Microsoft and 
> others on board, have a time-line for when they turn it off.

I gather that Google no longer pays attention to ARC headers, and 
Microsoft is phasing them out.

It doesn't hurt to add them, so there's no reason to remove the existing 
code, but as I said, I don't want people to waste time adding new ARC 
code.

> As a side-note in the above codebase, when a message is received with a 
> DKIM header, we replace the original "From: [e-mail] 
> <mailto:[e-mail]>" with "From: jeroen=massar.ch@via.<domain>", 
> then DKIM sign it ...

Yes, IETF lists including this one do a similar hack based on one I did 
for my sympa lists a quite a while ago.  One of the goals of DKIM2 is to 
let mailing lists stop using that ugly hack and just describe the changes 
they wanted to make so recipients can look back and see the original DMARC 
alignment, i.e., what we hoped ARC would do but in fact it doesn't.

R's,
John