smtp+spf and dynamic ip?

Decided to upgrade my postfix and put a mailserver back online with the
latest and greatest. It looks like SPF has stuck around. Couple of
questions tho:

1. Am I correct in reading between the lines that SPF and dynamic ip
updaters won't work and play well together?

2. Even tho SPF has stuck around, doesn't mean it's caught on. Has it
caught on?

3. Has it reached a critical mass yet?

Thanks,

-- 
  AFABCO
  afabco.com
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