On Sun, Jun 02, 2024 at 07:19:38AM +0800, Jeff P via Postfix-users wrote:
> I am using a subdomain xxx.eu.org for sending email.
> Though I have not set a dmarc for xxx.eu.org, but gmail says DMARC pass.
> So i checked that eu.org does have a DMARC record:
>
> _dmarc.eu.org. 7200 IN TXT
> "v=DMARC1;p=none;sp=none;pct=10;rua=mailto:dmarc-mas...@eu.org;ruf=mailto:dmarc-mas...@eu.org";
>
>
> My question is, for my sender email - u...@xxx.eu.org, which domain should
> be checked for DMARC? xxx.eu.org, or eu.org?
There is no definitive answer. Only rough guidance:
https://datatracker.ietf.org/doc/html/rfc7489#section-3.2
Some receiving systems may use a different search algorithm. See, for
example (expired draft):
https://www.ietf.org/archive/id/draft-levine-dmarcwalk-00.html
--
Viktor.
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