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sdgathman / pyspf

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Detect a non-trivial subset of AlwaysPass policies #37

Open sdgathman opened 2 years ago

sdgathman commented 2 years ago

In addition to "v=spf1 +all", any sequence of positive matches ending in +all will always return Pass. Admins may wish to impose additional restrictive treatment on such worse than non-existent sender policies. @DanielAbrecht

sdgathman commented 2 years ago

I think this algorithm works:

if result is Pass and mechanism is "all":
  if all previously evaluated mechanisms were + (but didn't match, obviously):
    policy is "degenerate" and must alway return Pass