Correct. ESPs need to process async bounces to help their customers adhere to best practices. The only way to do that (for a rfc5322.from domain which typically has MX pointed at a mailbox host) is to use a return path subdomain with MX pointed at the ESP.
Strict DKIM alignment would be easier to consider requiring since individual selectors can be delegated easily. Jesse On Wed, Oct 18, 2023, at 3:45 PM, Neil Anuskiewicz wrote: > > > >> On Oct 18, 2023, at 7:24 AM, Todd Herr >> <todd.herr=40valimail....@dmarc.ietf.org> wrote: >> >> On Tue, Oct 17, 2023 at 9:51 PM Douglas Foster >> <dougfoster.emailstanda...@gmail.com> wrote: >>> Why do we need to support relaxed alignment at all? >>> >> >> A common use case for relaxed alignment is when an organization (e.g., >> WeSellStuff) employs a third party Email Service Provider (e.g., >> WeSendEmail) to send mail on the organization's behalf. In that case, we >> might have the following: >> >> Return-Path domain: bounces.wesellstuff.com >> DKIM signing domain: wesendemail.wesellstuff.com >> RFC5322.From domain: marketing.wesellstuff.com >> >> The above configuration allows for WeSendEmail to manage the SPF record for >> bounces.wesellstuff.com and for an MX record for bounces.wesellstuff.com to >> be pointed at WeSendEmail, so that they can handle bounce processing and >> other Delivery Status Notifications. >> >> It also allows for WeSendEmail to DKIM sign on behalf of WeSellStuff using a >> dedicated subdomain that is delegated to WeSendEmail, which can publish the >> public key in DNS and generate the private key and keep it private to use >> for signing mail it sends. >> >> Meanwhile, WeSellStuff only has to delegate responsibility for those parts >> of the DNS that are specific to WeSendEmail's sending to WeSendEmail. > > Yes, strict alignment would be *very* disruptive to a LOT of senders. > _______________________________________________ > dmarc mailing list > dmarc@ietf.org > https://www.ietf.org/mailman/listinfo/dmarc >
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