On Sep 26, 2007, at 3:17 PM, Michael Deutschmann wrote:
So if the SPF for example.org is:
example.org IN SPF "v=spf1 a:123.45.67.89 -all"
Then the CLSPF for [123.45.67.89] might be:
89.67.45.123.in-addr.arpa IN SPF "v=clspf d:example.org -all"
That would be cool if we could get buy-in from all the ISPs to trawl
through their IP ranges and do this... it reminds me of an earlier
proposal we saw a few years back, called "MTAMark" or "Selective
Sender".
http://old.openspf.org/marid/
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