On Thu, Nov 10, 2022 at 4:43 PM Alessandro Vesely <[email protected]> wrote:
> On Thu 10/Nov/2022 17:14:32 +0100 John R Levine wrote: > >> It says: > >> > >> Multi-valued RFC5322.From header fields with multiple domains > >> MUST be exempt from DMARC checking. > >> > >> Does it mean that it is enough to add a second mailbox in order to have > the > >> failure of the relevant DKIM signature become unmeaningful and accept > with > >> dmarc=none? > > > > No, of course not. > > But then, what should a mail filter do when it meets one? > DKIM (assuming oversigning, which you mentioned earlier) fails verification. If the multi-valued From field expresses multiple domains, then DMARC ignores the message, otherwise it runs the usual algorithm relative to that single domain. The receiving mail filter is free to consume those results or not as it sees fit. -MSK, participating
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