You are right, it is a common practice to check on PTR records
(https://tools.ietf.org/html/rfc2505).
Further for existing not mailing domains rfc7505
https://tools.ietf.org/html/rfc7505 should be used.
Mail servers like postfix block connections by default when a null mx
record is published.
Regards,
Jan Bouwhuis
Op 8-4-2021 om 20:29 schreef John Levine:
It appears that Murray S. Kucherawy <[email protected]> said:
-=-=-=-=-=-
On Thu, Apr 8, 2021 at 9:50 AM Douglas Foster <
[email protected]> wrote:
Why is it problematic to document this risk, and indicate that when "No
Policy detected" occurs, it is recommended to check whether the domain
exists, and if it does not exist then local policy for nonexistent
domains
should be applied?
Can you put together an example message exhibiting the properties you're
talking about, and what DNS records are in play in that scenario?
I still can't picture the problem you're trying to solve.
My question would be what does it have to do with DMARC.
We already have policies for dealing with non-existent domains
unrelated to DMARC.
R's,
John
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