On Sat, Feb 1, 2025 at 2:03 PM Alessandro Vesely <[email protected]> wrote:
> On Sat 01/Feb/2025 00:31:02 +0100 Todd Herr wrote: > > On Fri, Jan 31, 2025 at 5:01 PM Damian Lukowski <rfc= > [email protected]> wrote: > > > >>> In practice, how common are messages with no domain in the From > header? > >>> I don't recall seeing any and I would expect that if there are any, > >>> they're all spam that would get filtered for other reasons.>> > >> After seeing [1], I tried to find out whether DMARCbis had something > else > >> to say about such case. > >> > >> [1] https://github.com/msimerson/mail-dmarc/pull/255 > > > > Where in the DNS would one find a DMARC policy record named > > "_dmarc.localhost"? > > > On your server you can define whatever you like. I have "localhost" in > named.conf.default-zones, from Debian defaults IIRC. Could add _dmarc as > well... > > > And why would one bother to do that? DMARC is for attempting to determine if a third-party Domain Owner has authorized the use of its domain in the RFC5322.From header in mail that is inbound to me. Mail inbound to my mail server that has an RFC5322.From domain that is either "localhost" or "localhost.localdomain" and is from an external source is clearly mail from an at-best misconfigured or unconfigured mail server, and should be rejected out of hand simply because of that fact; DMARC has no role to play here. -- Todd Herr Some Guy in VA LLC [email protected] 703-220-4153 Book Time With Me: https://calendar.app.google/tGDuDzbThBdTp3Wx8
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