Re: SPF and SenderID

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