SPF - Grin with cat attached — LiveJournal
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SPF Dec. 10th, 2003 06:31 pm
The SPF (Sender-Permitted-From) anti-spam / anti-forgery protocol has just reached a release client for v1, which I've just implemented on my most-used domains.
It's a whole hell of a lot simpler than the last version I tried to implement.

SPF: http://spf.pobox.com/
Implementation tester: http://www.infinitepenguins.net/SPF