On Tue, 2010-02-23 at 16:17 -0500, Bowie Bailey wrote: > The only exception is if you have a strict SPF policy for your own > domain, you can use it to reject spam pretending to be from your users. > Agreed. That's all I use it for. I installed SPF during a backscatter storm, which immediately decreased in volume. Since then the periodic backscatter showers have got steadily smaller, so it looks as though mailservers configured check SPF before bouncing undeliverable mail have been getting steadily more common.
Martin
