wayne writes "Microsoft has now put the SenderID patents under the OSP. The Open Specification Promise was discussed on slashdot before in conjunction with web services and it is good to see that they are opening up even more. There are still technical problems with SenderID compared with SPF and, of course, SPF isn't problem free. Still, over the last year, the number of SPF records has more than doubled from around 1.7 million to 4.1 million, with rate of growth increased in the last 6 months."
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