... that the vast majority of implementations where the administrator is using an OSS MTA will end up using SPF Classic (I do) as it does not appear to be encumbered by intellectual property issues. The critical difference between SPF Classic and Sender-ID (other than the fact that it is not encumbered by a patent) is that SPF Classic checks the RFC2821 headers and Sender-ID checks the RFC2822 headers. Personally I think that RFC2821 checks will do a better job preventing forgery.
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The Upshot will likely be...
Posted by: Chuck Mead on August 29, 2004 11:34 AM#