Nikolaos Milas:
> On 8/9/2017 1:56 ??, Allen Coates wrote:
> 
> > DUNNO means "let something else decide" ...
> 
> Hi Allen,
> 
> I understand that, but shouldn't this also mean "Bypass ALL 
> postscreen-related checks & filtering", which should avoid blocking by 
> RBLs used within postscreen?

It means this:

        dunno All postscreen(8) access lists implicitly have this  command  at
              the end.
              When   dunno  is executed inside a lookup table, return from the
              lookup table and evaluate the next command.
              When  dunno  is executed outside a lookup table,  terminate  the
              search,  and  subject  the client to the configured before/after
              220 greeting tests.

Just as with smtpd access maps, permit/reject are a final decision,
and dunno means 'let something else make the decision'.

        Wietse

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