Stuart D. Gathman wrote:
Since the purpose of SPF is *not* to process or query TLD names
themselves, I'd say I'm more convinced than ever that TLDs are no
FQDNs in the context of SPF. Thanks for quoting that.
The purpose of SPF is to divine permitted and forbidden IPs based
on a "hello" domain or envelope sender address.
One of the mechanism it offers for this purpose is "a" specifying
IPs "by name" for an A or AAAA query.
Querying TLD "museum" I get an IP:
http://vweb.nass.com.au/cgi-bin/dnslookup?data=museum
Using "museum" as host in an http URL also works: http://museum
Other protocols might also work, but as far as SPF is concerned
we're only interested in A, AAAA, CNAME, MX, PTR, SPF, and TXT
records in DNS, or "ANY" record to distinguish it from NXDOMAIN.
TLD "museum" has the needed A record for SPF's "a" mechanism when
checked in conjunction with an IPv4 connection.
Frank
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