John R. Levine wrote on 2023-07-17 18:22:
On Mon, 17 Jul 2023, Shumon Huque wrote:
...
This is not a new issue. It is the well known record subtyping
problem that was advised against in RFC 5507 (IAB; "Design Choices
When Expanding the DNS"). That advice was targeted to new RR type
design, but it applies just as well to this type of use of TXT
RDATA resident at the same name.
Agreed, but that horse had already left the barn when we published the
first SPF RFC 4408.
RFC 4408 was folly. TXT in a subdomain (RFC 5507 s3.2) would suit domain
verification well (wildcards aren't a factor) and would in no way be
precluded by the SPF design. perhaps a sub-domain under
._wellknown.$apex, to match current style in the w3c world.
--
P Vixie
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