On Mon, Jun 23, 2025 at 09:05:38AM +0200, Jaroslaw Rafa via mailop wrote: > Dnia 18.06.2025 o godz. 10:02:47 Yves-Marie LE PORS-CHAUVEL via mailop pisze: > > Hi there, > > > > Since Monday 11:10am UTC, we see a huge rise of that SMTP answers with > > Outlook : > > > > *550 5.7.515 Access denied, sending domain DOMAIN.TLD doesn't meet the > > required authentication level. The sender's domain in the 5322.From address > > doesn't meet the authentication requirements defined for the sender. To > > learn how to fix this see: > > https://go.microsoft.com/fwlink/p/?linkid=2319303 Spf= Pass , Dkim= Fail > > , DMARC= Pass [XXXXXX] [XXXXXXXXXX]* > > They state "DMARC=Pass" yet they still reject the mail only because DKIM > fails (from their point of view of course)? > > What a nonsense! Why they check DMARC at all if they require *both* SPF > *and* DKIM to pass?
Because DMARC, SPF, and DKIM are different things, that assert different properties of the email, and thus may have different values to the receiving site's policy. - Matt _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
