Re: mailing lists are complicated, was Email explained from first principles
Dave Crocker <[email protected]>
| Newsgroups | gmane.ietf.smtp |
|---|---|
| Organization | Brandenburg InternetWorking |
| Message-ID | <[email protected]> |
On 5/29/2021 7:23 AM, John R Levine wrote: > On Sat, 29 May 2021, Alessandro Vesely wrote: >> ARC is a completely different thing. It introduces a third party, the >> sender, which modifies the message header in such a way to induce >> receivers to accept a message even if it fails DMARC. Semantically, >> it is very similar to Dave's Use of the Sender Header Field. > > Ho, it is really nothing like that. It provides log info to so that the > final recipient can retroactively do filtering that the intermediate > hosts didn't. It is true that you do have to know which intermediate > hosts might plausibly do that, but small systems rarely get ARC'ed mail > from more than a handful of places. > >> I see no conflict between these two methods. Me either. One says "Here is the original author information." The other says "1) When I got this message, here is how the DMARC evaluation came out, and you can trust these results if you trust me; and 2) Here is the collaborative handling sequence since that evaluation" Very different semantics. d/ -- Dave Crocker Brandenburg InternetWorking bbiw.net _______________________________________________ ietf-smtp mailing list [email protected] https://www.ietf.org/mailman/listinfo/ietf-smtp