On Wed 21/Jul/2021 10:28:36 +0200 Laura Atkins wrote:
[deprecate PCT entirely] is going to cause difficulties in deployment for a lot of companies and domains. Experience tells us that p=quarantine pct=0 detects forwarders and other types systems that modify and break DMARC authentication. These systems are undetectable when p=none is in place.
+1, although some DMARC records in the wild betray a poor understanding of how it works, pct is a useful ratchet and we should keep it.
I understand and support removing PCT 1 - 99, but think that removing pct=0 will make it even more difficult for companies to deploy DMARC.
My main objection to removing pct 1-99 is that it would make for a nasty wording, not to mention the hassle of backward compatibility. (Didn't we say we're not going to make DMARCv2?) Indeed, since pct=100 is the default, what would we use for pct=0? Just-kidding=1? In addition, since I cash domain data and have a sample of 121,329 domain records, 5,980 (~4.9%) of which have a DMARC record, I can try to answer the question that John asked yesterday at 5pm. Some domains do seem to evolve their pct. I found 214 domains having a two-digit pct. It is only ~3.6% of DMARC records, but, if you concede any statistical relevance to my data, it proves that the pct feature is more or less as important to DMARC as DMARC itself is important to email in general. That is, by domain numbers, even if it is not so important, oversimplifying feels like throwing the baby out with the bathwater. Of those 214 domains experimenting with pct, 115 (~53.7%) did not change it yet, 51 (~23.8%) failed to serve a DMARC record, 43 (~20%) raised it to full percentage, and 5 (~2.3%) played other changes. Change details are as follows, newest to oldest: umn.edu had pct=0 on 2021-07-21 15:54:31, now pct=100 constantcontact.com had pct=10 on 2021-07-21 05:30:27, now pct=100 nannyjob.co.uk had pct=50 on 2021-07-20 21:06:47, now default mailerlite.com had pct=5 on 2021-07-20 16:48:01, now pct=100 kernel.org had pct=1 on 2021-07-18 20:25:34, now default db.com had pct=15 on 2021-07-14 16:12:38, now pct=25 developers.italia.it had pct=5 on 2021-07-13 19:19:45, now default revfr.today had pct=30 on 2021-07-12 16:29:08, now not found caser.today had pct=30 on 2021-07-12 05:31:20, now not found ericsson.com had pct=0 on 2021-07-08 10:53:37, now default crif.com had pct=25 on 2021-07-06 14:28:33, now default p-a-finbergadvisor.com had pct=1 on 2021-06-10 11:10:28, now default economiasviluppo.com had pct=1 on 2021-06-07 22:07:50, now default medody.com had pct=40 on 2021-05-22 15:19:27, now not found pafinberg.net had pct=1 on 2021-05-21 09:07:51, now default xss.de had pct=1 on 2021-05-20 23:35:57, now default paddle.com had pct=5 on 2021-05-02 15:39:05, now pct=100 dnswl.org had pct=25 on 2021-04-27 19:50:49, now default rusoil.net had pct=1 on 2021-04-22 20:35:12, now default qa.jcb.co.jp had pct=50 on 2021-03-12 17:58:04, now default rni.com.pk had pct=0 on 2021-03-11 04:00:07, now not found cloudflare.com had pct=25 on 2021-03-08 17:50:09, now pct=100 nw.mailzaap.com had pct=5 on 2021-02-22 17:58:45, now not found nw.risparmisubito.it had pct=5 on 2021-02-14 07:53:21, now not found nw.promopremium.eu had pct=5 on 2021-02-13 14:54:37, now not found nw.scontiok.com had pct=5 on 2020-12-15 16:05:54, now not found hw.ac.uk had pct=5 on 2020-11-30 17:32:15, now default karta.website had pct=30 on 2020-11-25 04:55:33, now not found veicolimilano.it had pct=1 on 2020-10-07 02:02:26, now default jagoanhosting.com had pct=80 on 2020-09-25 02:42:44, now default vshosting.cz had pct=1 on 2020-08-11 18:05:14, now default techno-digm.com had pct=1 on 2020-08-05 08:45:36, now not found nw.graziepromo.com had pct=5 on 2020-08-04 09:09:04, now not found outreach.rehab4addiction.uk had pct=50 on 2020-07-31 10:09:39, now pct=20 xyonet.com had pct=5 on 2020-07-30 22:57:33, now default hanoi.gov.vn had pct=20 on 2020-06-17 01:54:54, now default silvanaeditoriale.it had pct=50 on 2020-05-08 17:22:06, now pct=25 hale.com.hk had pct=90 on 2020-02-26 14:37:42, now not found pasteur-cayenne.fr had pct=5 on 2019-12-27 04:27:44, now pct=90 nw.mailrogue.com had pct=5 on 2019-11-21 20:34:34, now default delivery-571.info had pct=40 on 2019-11-10 12:31:25, now not found opensystems.co.bw had pct=60 on 2019-10-17 01:26:10, now not found pafinberg.com had pct=20 on 2019-10-09 17:29:32, now default efaxreceive.xyz had pct=40 on 2019-09-23 15:58:07, now not found gameview.my had pct=20 on 2019-09-18 07:58:00, now not found nationizable.icu had pct=40 on 2019-09-02 17:16:37, now not found designifican.icu had pct=40 on 2019-08-09 20:02:11, now not found maersk.com had pct=1 on 2019-07-17 09:03:42, now default mebnet.net had pct=20 on 2019-06-28 04:33:46, now default qlc.in had pct=5 on 2019-06-04 00:21:26, now default primefinance.com had pct=15 on 2019-05-23 18:48:43, now default corrlinks.com had pct=25 on 2019-02-21 10:51:27, now default 0086.info had pct=5 on 2019-02-03 17:30:23, now not found studio-im.com had pct=5 on 2019-01-24 13:39:42, now not found crowdselector.eu had pct=40 on 2018-11-06 12:06:59, now not found eehmke.de had pct=25 on 2018-10-16 13:52:43, now default learningcompass.ga had pct=50 on 2018-07-24 16:00:08, now not found women.it had pct=2 on 2018-05-30 17:48:18, now not found ucdavis.edu had pct=5 on 2018-04-29 04:19:01, now default nasaprolifeone.com had pct=30 on 2018-02-20 03:30:01, now not found korrumpedia.org had pct=30 on 2018-02-17 00:56:57, now not found nasaprolifeadmin.com had pct=30 on 2018-02-15 23:59:32, now not found campaniaorlreaders.com had pct=30 on 2018-02-15 22:47:03, now not found campaniaorlreader.com had pct=30 on 2018-02-15 18:18:45, now not found emailepost.com had pct=30 on 2018-02-15 14:36:54, now not found servicepost.net had pct=30 on 2018-02-14 05:46:13, now not found ipostica.com had pct=30 on 2018-02-14 03:02:30, now not found postaname.net had pct=30 on 2018-02-13 16:48:51, now not found nasaprolife.com had pct=30 on 2018-02-13 14:01:46, now not found nuovoemail.net had pct=30 on 2018-02-13 12:38:22, now not found postaspa.com had pct=30 on 2018-02-07 04:22:28, now not found polinpdg.ac.id had pct=10 on 2018-02-06 03:06:29, now not found popularanimal.net had pct=30 on 2018-01-24 19:31:14, now not found bnl.gov had pct=10 on 2018-01-24 02:12:25, now pct=100 mail1.datongcloud.com had pct=50 on 2018-01-12 18:25:53, now not found hulusungaitengahkab.go.id had pct=20 on 2018-01-01 04:08:33, now default haladzhi.com.ua had pct=30 on 2017-11-24 01:59:41, now not found demmarkita2.com had pct=20 on 2017-10-18 13:56:23, now not found lada-date-brides.com had pct=30 on 2017-10-11 05:13:01, now not found know.kiev.ua had pct=30 on 2017-10-09 14:10:39, now not found opentext.com had pct=10 on 2017-09-28 22:43:18, now default modernposta.net had pct=30 on 2017-09-25 15:29:03, now not found stratoplan.ru had pct=5 on 2017-09-18 04:56:28, now default etc-brainwork-sev.com had pct=30 on 2017-09-12 21:52:19, now not found aabl.in had pct=50 on 2017-08-27 15:41:27, now not found voxel.larrylarson.com.br had pct=5 on 2017-08-24 17:25:42, now not found framestore.com had pct=6 on 2017-08-23 10:09:28, now pct=100 eu.org had pct=10 on 2017-07-25 19:42:09, now default terradox.ro had pct=5 on 2017-07-03 07:35:55, now not found macsales.com had pct=0 on 2017-06-22 19:46:57, now pct=100 opayq.com had pct=0 on 2017-06-09 12:44:37, now pct=10 ipoggioli.site had pct=0 on 2017-03-08 12:21:11, now not found td-gratis.ru had pct=25 on 2016-11-20 00:05:54, now not found lqfconos.com had pct=1 on 2016-10-24 20:00:38, now default systemcentral.net had pct=1 on 2016-09-16 16:01:07, now default spectranet.in had pct=50 on 2016-03-14 11:38:23, now not found unimelb.edu.au had pct=10 on 2016-02-28 02:36:47, now default savages.com had pct=5 on 2015-11-23 19:50:55, now default waltermoreno.com had pct=1 on 2015-05-02 22:09:08, now not found Best Ale -- _______________________________________________ dmarc mailing list [email protected] https://www.ietf.org/mailman/listinfo/dmarc
