It appears that Murray S. Kucherawy <[email protected]> said: >Can you give an example, even if only a hypothetical one?
I'm not Emmanuel but people at large mail systems have told me that the biggest value of ARC is to deal with mailing lists that do lousy spam filtering. Lists often let anything through that has the address of a subscriber on the From: line. Mail systems see legit lists that gush spam when some bot starts sending mail to the list with fake subscriber addresses, because the bot herder is using address pairs from stolen address books. While we all know the reasons that you don't want to enforce DMARC on the mail coming out of a mailing list, it makes a lot more sense to enforce it on mail going into a list. You can use ARC to look back and see if the mail was aligned on the way in and if not treat it as spam. R"s, JOhn _______________________________________________ dmarc mailing list [email protected] https://www.ietf.org/mailman/listinfo/dmarc
