Microsoft had this working even one year ago (i.e. they showed presentations in private with those yellow warning tags), but going public with this and corresponding press announcements right now likely have to do with that IESG is reviewing SID drafts (their teleconference is tomorrow) and MS wants to put more pressure on them because so far its failing to gain enough votes because of technical problems with SID scheme and that it wants to reuse v=spf1 without proper authorization of domain owners in incompatible way: https://datatracker.ietf.org/public/pidtracker.cgi?command=print_ballot&ballot_id=1573&filename=draft-lyon-senderid-core (where as SPF itself has more votes and might actually pass though barely) For more info on what MS and SID is doing wrong see: http://www.openspf.org/OpenSPF_community_position_v102.html http://www.gossamer-threads.com/lists/spf/discuss/19859 P.S. It would really be great if IETF remained true to its origin and goals did did technical reviews and selected proposals based on the technical capabilities and not on what large company is exerting pressure on them (especially not by means of press announcements). But I guess "E" is now turning more and more into "V", see: http://www.merit.edu/mail.archives/nanog-futures/msg00019.html -- William Leibzon Elan Networks william@elan.net