this domain xrtwo.com, also does not seem to have a secondary ns record on euk DNS.
MS bragged about the benefits of SIDF - Sender ID Framework (MS version of SPF) last year on 1st march 2006 and mentioned that 75 million domains using this feature had/generated lesser spam. So I suspect they may have been testing it for one more year and implemented it on 1st march 2007 onto MSN LIVE mail - the flash/xml avatar of hotmail. Though I do not have any official/authentic report about this. They used to call it emailauthentication.org but now call it AOT - Alliance for Online Trust (or something).
Regds
IJ
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