On Sun, Aug 23, 2026 at 10:53:47PM -0700, Mark Sapiro wrote: > On 8/23/26 21:55, [email protected] wrote: > > On Mon, 24 Aug 2026, Stephen J. Turnbull wrote: > > > Note that DMARC is a demand by *senders* that receivers reject email > > > apparently from them in certain circumstances. If there is a non-null > > > DMARC policy, most recipients will respect it. But (outside of the > > > authoritarian crank faction of the IETF's email working group) I've > > > never heard a suggestion that *recipients* should demand a DMARC > > > record of senders. > > > > WOW, in what decade have YOU been sending emails on a list? Not recently! > > Steve was responding to the assertion in the post at > https://mail.python.org/archives/list/[email protected]/message/UYBJRLGIUSYHHRMS74MGCIHSIYAFJ7QM/ > that "Most of the email servers in the world now require DMARC records or > they will reject your emails." > > I.e. the assertion is that even if my mail passes DKIM and SPF with a domain > aligned with the From: domain (i.e. passes DMARC with flying colors), it > will be rejected if my domain does not publish a DMARC policy. Are there > really major recipient domains that will reject my mail solely because my > domain doesn't publish a DMARC policy.
If you send over 5,000 emails a day to Google or Microsoft hosted recipients, you *must* use DMARC apparently (amongst requirements). https://support.google.com/mail/answer/81126?sjid=3367894452285755714-EU https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/strengthening-email-ecosystem-outlook%E2%80%99s-new-requirements-for-high%E2%80%90volume-senders/4399730 ------------------------------------------------------ Mailman-Users mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3/lists/mailman-users.python.org/ Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: https://www.mail-archive.com/[email protected]/ https://mail.python.org/archives/list/[email protected]/ Member address: [email protected]
