I'm guessing that this is a precursor to enforcing it for all Microsoft controlled domains. Though presumably they will have trouble enforcing it for Microsoft.com, unless they're already prepping the next version of Exchange to include spf/senderid support :)

I'm not 100% sure, but I think I read that this is going to be in Exchange 2003 SP2 - I think it's part of the "edge services" thing that's in SP2. Nic -- Nic Wise - Senior Developer - Microsoft MVP (.NET) AfterMail Limited. t. +64.21.676.418 w. http://www.aftermail.com/ e. nic.wise(a)aftermail.com b. http://www.fastchicken.co.nz/blog/