It appears that Murray S. Kucherawy <superu...@gmail.com> said: >There is indeed more of a burden on sending domains and registry operators >to publish the needed markers in the DNS before this will all work the way >we want it to. ...
Not really. If a mail sender has a DMARC record at its org domain, and there are no DMARC records above the org domain, things will work correctly, no psd tag needed. I expect that in practice this will happen 100% of the time, rounding to the closest 0.01%. That's why it is not a problem that popular TLDs like .com, .org, and .net will never publish a DMARC record, with or without psd=y. There are at least 200 million registered domains but less than 10000 domains in the PSL. For PSDs, we are talking about one domain in 20,000, or about 0.005% of registered domains. Having surveyed all of the domains in the PSL to see which ones publish DMARC records, I can report that the ones where the lack of a psd tag might plausibly cause problems can be counted on your fingers. Some of those already have np= tags which tells us they're aware of what's going on. (See for example _dmarc.uk.com.) The tree walk works fine. The psd tag is an arcane nit, mostly useful to a handful of TLDs like .bank and .insurance that want to use the aggregate reports to audit their registrants' mail configuration. R's, John _______________________________________________ dmarc mailing list dmarc@ietf.org https://www.ietf.org/mailman/listinfo/dmarc
