Something that I've been pondering for quite a while is what should
happen if you have an SPF record with a redirect= modifier, but the
target domain is malformed, non-existant or has no SPF records?
I'm pretty sure the current language, and that of mengwong-spf-0[01],
calls for the result to be "None", since the redirect= modifier acts
pretty much as if the process is starting over.
Should redirect= be treated the same as include:? Should the result
simply be Neutral rather than None?
With all the talk about getting rid of ?all and treating Neutral
different than None, you might want to ponder about domain owners just
switching to redirect=foo instead of ?all.
-wayne