> From: discuss-bounces-mNDKBlG2WHs at public.gmane.org [mailto:discuss-bounces-mNDKBlG2WHs at public.gmane.org] On Behalf > Of Jerry Feldman > > > What's the downside? I'm genuinely curious. > > > None that I can see. He's an Exchange Guy The exchange comment seems unrelated, except, that in MS land, SPF is called SenderID.