Proposal for the mapping to DNS for RBL style lookup -- so that sendmail
people can jump on board quickly.
1) Obtain an SPF domain name. E.g. s-p-f.net
2) Define mapping: propose
<helo>._FROM_.<from>.<ip>.check.s-p-f.net
3) Find 1 or more sites willing to run this service. Install software.
4) Put up a web page on check.s-p-f.net (probably a redirect to
spf.pobox.com)
5) Publicize
6) Relax
Philip
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