Sender Policy Framework

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Lars Eggert added SPF to his set of experimental deployment meters.
Various Internet Drafts & RFCs reference SPF.
InfoWorld quoted a report that says SPF usage "increased to 12.6 percent [of domains] in 2007 compared to only 5 percent last year." (see the last three paragraphs of this article).
spf-all.com counts domains publishing SPF -all policies.

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