That was weird-- I did not send that email and it was marked from Ale. As Chair, let's wrap this thread up now.
On Thu, Mar 6, 2025 at 11:48 AM Laura Atkins <[email protected]> wrote: > > > On 6 Mar 2025, at 16:39, Alessandro Vesely <[email protected]> wrote: > > On 06/03/2025 14:44, Laura Atkins wrote: > > On 6 Mar 2025, at 12:45, Seth Blank <[email protected]> > wrote: > On 05/03/2025 03:34, Douglas Foster wrote: > > But it is an IETF problem because IETF is a significant implementer of the > technology, and fully capable of either building a custom solution or > motivating a vendor to do so. Not only has it not done so, it has not > used DMARC to protect its lists from the most conspicuous form of > impersonation, as demonstrated by a white-hat research attack. > > > Rejecting on p=reject should be a no-brainer for a mailing list. > > > Most lists, including this one, decided to rewrite the from address rather > than reject users behind a p=reject. > > > > They are two unrelated operations that serve different purposes. > > Rewriting the From: address before forwarding is useful to avoid > DMARC-produced rejects at the subscriber's MX. > > Enforcing DMARC by a mailing list is useful to avoid impersonation of > valimail's users, since valimail has p=reject. > > > Yes. I understand how DMARC works. I misunderstood Seth’s comment. > > I do appreciate the decisions that the IETF made that makes it possible to > find individuals in the archives by searching for a per-sender unique > address. Other lists have basically made it impossible to find “that post > written by joe” > > laura > > While most "generic" MTAs cannot impose to their users to not receive > forwarded messages, a mailing list can well require that posters use their > subscriber address. For example, this list[*] has a "Manage Subscription" > menu which contains a form to "change the email used for this > subscription". In what case would a post arrive indirectly instead? > > > Best > Ale > -- > > [*] https://mailman3.ietf.org/mailman3/lists/dmarc.ietf.org/ > > > > > > > _______________________________________________ > dmarc mailing list -- [email protected] > To unsubscribe send an email to [email protected] > > > -- > The Delivery Expert > > Laura Atkins > Word to the Wise > [email protected] > > Delivery hints and commentary: http://wordtothewise.com/blog > > > > > > > _______________________________________________ > dmarc mailing list -- [email protected] > To unsubscribe send an email to [email protected] > -- *Seth Blank | Chief Technology Officer* Email: [email protected] This email and all data transmitted with it contains confidential and/or proprietary information intended solely for the use of individual(s) authorized to receive it. If you are not an intended and authorized recipient you are hereby notified of any use, disclosure, copying or distribution of the information included in this transmission is prohibited and may be unlawful. Please immediately notify the sender by replying to this email and then delete it from your system.
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