Then how about a subdomain like "spf-conf"? Even without the leading
hyphen or underscore that should have relatively low collision risk.
I'd prefer just to go for either a TXT record (with specified data,
obviously) or a new RR type. In either case hostname rules are then
irrelevent.
This overloading of A records as flags bothers my sense of protocol
aesthetics far more than the use of TXT records versus a new RR.
(Although its pragmatic impact may be lower...) This use of A records
here just seems weird to me...
-roy
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