On 03/04/2025 18:14, John Levine via mailop wrote:
It appears that Simplelists - Andy Beverley via mailop <a...@simplelists.com>
said:
A query for _dmarc.gcu.edu.dmarc.has.pphosted.com results in a NOERROR
response, while a query for its ancestor, edu.dmarc.has.pphosted.com,
returns a name error (NXDOMAIN), which indicates that subdomains of
edu.dmarc.has.pphosted.com, including
_dmarc.gcu.edu.dmarc.has.pphosted.com, don't exist. See RFC 8020, Sec. 2.
I'm not sure that's related, but it surely doesn't help.
It probably is. If a client does qname minimization, it will
check edu.dmarc.has.pphosted.com before the subdomains and if
it gets NXDOMAIN it will stop and return a NXDOMAIN for the
original query.
Thanks John, much appreciated.
Andy
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