Other Resources
Much of this FAQ can also be read in dialogue form.
The rationale document describes some of the reasoning and choices behind SPF.
An eWeek-tutorial written in 2008 by Michael Smith explains how the author tamed the old SPF wizard (formerly at http://old.openspf.org/wizard.html
, now retired) and arrived at a sound policy. Terry Zink wrote a series of blog articles about backscatter covering SPF and BATV.