On Sun, 22 Nov 2020, Michael Thomas wrote:
The ARC signature has a sequence number so you can track the chain of custody. You are right that it is similar to the DKIM signature but the extra ovehead doesn't seem excessive.Did the wg consider just grafting that onto the DKIM signature itself instead of having essentially a duplicate signature? Receivers are already supposed to ignore any tags they don't understand so it shouldn't hurt backward compatibility.
ARC is an experiment that came from the people who designed DMARC. It's not a WG product.
Having adapted the perl DKIM module to handle ARC signing and verification, I can say that the extra signature is not a big deal. If you look at mail coming from large mail systems, they're full of other junk headers and the extra overhead of AMS along with DKIM is not important.
Regards, John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY Please consider the environment before reading this e-mail. https://jl.ly
_______________________________________________ dmarc mailing list dmarc@ietf.org https://www.ietf.org/mailman/listinfo/dmarc
