Re: [dmarc-ietf] SPF/DKIM/DMARC statistics observed at UMN (past 30 days)

2023-06-16 Thread Steve Siirila
Hector, Answers inline below. On Fri, Jun 16, 2023 at 11:30 AM Hector Santos wrote: > Steve, > > Thanks for the inbound MX verification stats. > > Can I ask, does the umn.edu mx network of compliant SPF/DMARC servers > honor the Reject and Quarantine? > Yes. We only did this after a year or

Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal

2023-06-16 Thread Michael Kliewe
Hi, Am 16.06.2023 um 13:28 schrieb Sebastiaan de Vos: The need for separate DKIM failure codes to be able to separate between in-transit changes and public key errors is more than just valid and I don't consider SPF worthless in general, but I just find it disturbing how the obviously

[dmarc-ietf] SPF/DKIM/DMARC statistics observed at UMN (past 30 days)

2023-06-16 Thread Steve Siirila
Below is a table of SPF/DKIM/DMARC statuses over the past 30 days on our inbound MX servers (umn.edu and several *.umn.edu domains). Note that we employ a DMARC policy of p=reject; also note that we have split our dmarc 'fail' status into three categories: *fail* indicates a DMARC failure where

Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal

2023-06-16 Thread Sebastiaan de Vos
The need for separate DKIM failure codes to be able to separate between in-transit changes and public key errors is more than just valid and I don't consider SPF worthless in general, but I just find it disturbing how the obviously misplaced confidence in SPF currently weakens the whole DMARC

Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal

2023-06-16 Thread Alessandro Vesely
On Fri 16/Jun/2023 13:02:46 +0200 Douglas Foster wrote: The solution is to talk about the differences in confidence provided by the different authentication methods, and note that evaluators have reason to distrust some of them. That distrust could cause a weakly authenticated message to be

Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal

2023-06-16 Thread Douglas Foster
RFC 7489 takes 8 different authentication mechanisms and lumps them into a single PASS result: DKIM or SPF, each with up to four types of alignment: same domain, parent->child, child->parent, and sibling->sibling These eight mechanisms all provide some level of confidence that the message is not

Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal

2023-06-16 Thread Sebastiaan de Vos
Many thanks.  That figure seems to be more or less in agreement with what others here have obtained on smaller samples.  However small, it may confer to SPF the role of a stabilizer in DMARC mail flows. How could SPF be a stabilizer when it's proven to be a highly unreliable mechanism? I'd

Re: [dmarc-ietf] DMARC2 & SPF Dependency Removal

2023-06-16 Thread Alessandro Vesely
On Thu 15/Jun/2023 23:25:44 +0200 Tero Kivinen wrote: I rerun the statistics and yes, there is 0.84% cases where dkim failed, but spf returned either pass, softfail or neutral. Many thanks. That figure seems to be more or less in agreement with what others here have obtained on smaller