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Well if you won’t do Sender ID we will patent SPF, take that.


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First AOL decides not to do the Microsoft Sender ID any longer.  Instead they are moving to SPF.  Microsoft is not happy but says this does not hamper their efforts.

America Online Inc.'s announcement Wednesday that it would abandon its attempts to support Microsoft's Sender ID e-mail authentication standard are a serious setback for the Redmond, Wash., software company.

AOL still will provide Sender ID information for outgoing mail so that its users can communicate with e-mail providers using that system, but that will be the limit of support for the standard. AOL, meanwhile, is moving ahead with its plans to implement the industry-standard Sender Policy Framework.


But shortly after, here comes a news announcement on a new Microsoft patent that, arguably by some, mocks the Sender Policy Framework (SPF) used.  Basically the supposed patent-free technology now has patents being applied for.
This time, a Microsoft patent made public Thursday appears to be broad enough to cover not only methods of the authentication algorithms for which Microsoft wants licensing but also the SPF (Sender Policy Framework) method being touted as a patent-free alternative, according to legal experts and participants in the e-mail authentication working group.