Tony Finch wrote:
As far as a "sender policy" is concerned, IPv4 1.2.3.4 can't
have an SPF (or TXT) record, and therefore it's pointless to
talk about it in RFC 4408.
Put them under in-addr.arpa next to the PTR record.
The RIRs asked MARID to stay away from such ideas, and for the
purposes of RFC 4408, which boils down to a rather convoluted
way to classify IPs as "verboten" or permitted, it was anyway
irrelevant.
For SSP I also don't see it yet, and with its attitude towards
RFC 2822 SSP can as well judge domain literals as "suspicious",
and I can contribute my favourite RFC 822 quote for this stunt:
| Note: THE USE OF DOMAIN-LITERALS IS STRONGLY DISCOURAGED. It
| is permitted only as a means of bypassing temporary
| system limitations, such as name tables which are not
| complete.
Frank
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