I am looking for data about a particular type of non-existent domain. The PSD spec addresses the problem of non-existent organizations. Evaluators could extend that initiative by using the PSL to check for any non-existent organization domain, without limiting the test to DMARC participating registrars.
What about non-existent subdomains of existent organizations? We certainly could define a special test for this situation, but would it be useful? Can someone produce evidence of a spammer using an RFC53322.FROM address for a non-existent subdomain of a registered domain, on at least one message? It would be interesting to also know the DMARC policy that applied to the message, if available. Doug Foster
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