On Wed, Apr 13, 2022 at 2:25 PM Jim Fenton <[email protected]> wrote:
> On 12 Apr 2022, at 20:39, Seth Blank wrote: > > > Policies: https://dmarc.org/2022/03/dmarc-policies-up-84-for-2021/ > > > > For mailboxes that implement DMARC and send reports, Valimail (and > Dmarcian > > I believe) have historically tracked and published that. I'll hunt down > > that data tomorrow. Off the top of my head, it was about 80% of mailboxes > > globally (4bn+) properly validate DMARC, and the majority of those send > > reports, with the notable exception of Microsoft, which is now finally > > starting to do that. > > Out of curiosity, what does “properly validate DMARC” mean and how do you > measure it? If it means “retrieved the DMARC record”, that’s a metric but > not all that meaningful. I run Spamassassin so I probably would be part of > that metric but I’m not doing anything with the result. For that matter, > Spamassassin used to retrieve ADSP records. > > If, on the other hand, it means that the recipient domain is acting on a > DMARC-published policy, that would be meaningful but I’m not sure how one > would measure that. > Yes, "properly validates DMARC" means the mailbox provider validates and handles the message per RFC 7489. This is easy to measure, because there aren't that many large mailbox providers, and most are a) public with how many mailboxes they represent, b) public with the fact that they validate DMARC, and c) (in nearly all the cases, sans Microsoft) send reports which can be used to confirm the proper handling of messages per published policy. S > > -Jim > -- *Seth Blank * | Chief Product Officer *e:* [email protected] *p:* 415.273.8818 This email and all data transmitted with it contains confidential and/or proprietary information intended solely for the use of individual(s) authorized to receive it. If you are not an intended and authorized recipient you are hereby notified of any use, disclosure, copying or distribution of the information included in this transmission is prohibited and may be unlawful. Please immediately notify the sender by replying to this email and then delete it from your system.
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