Kjetil Torgrim Homme wrote:
address literals obviously can't be used with CSV.
Nor with SPF, but MTAMARK could help (directly or
indirectly as source for SIQ or traditional DNS?L)
[...]
this is where SPF tries to find the zone cut
That was never implemented and finally removed from
the spec. => no more zone cut in the SPF RfC
dozens of DNS queries
More like one (q=ns), but as I said it was removed.
CSV uses in the worst case six queries instead of a
zone cut.
a spammer can just as easily delegate himself arbitrarily
many subdomains.
Yes. The CSV idea is pretty irrelevant to fight abuse, it
is more about accelerated processing of white / grey MTAs,
not about intentionally black hats... Unless you're ready
to reject all mails from unidentified sources. Bye, Frank