On Wednesday 16 November 2011 10:39:00 I wrote:
> A single reject action anywhere before acceptance causes the mail
> to be rejected. Numerous permit (or dunno) actions are required
> for acceptance; one per restriction stage, one per each header
> evaluated in header_checks(5), one for each line in
> body_checks(5).

Strictly speaking, there must be a dunno/permit for each individual 
restriction in each stage. Order matters, of course; a permit action 
terminates the processing of further restrictions in that stage. But 
in this regard a header_checks rule is like a restriction stage unto 
itself.
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