Michael McCallister:
> Hi,
> 
> Does postscreen_dnsbl_ttl apply to nxdomain responses as well?  For 
> example, lets assume an IP lookup on zen.spamhaus.org returns nxdomain 
> and postscreen_dnsbl_ttl is set to an hour - postscreen won't check 
> again for another hour?  Or does that caching only apply to non-nxdomain 
> responses.

postscreen_dnsbl_ttl (default: 1h)
   The  amount  of time that postscreen(8) will use the result from a suc-
   cessful DNS blocklist test. During this time, the client IP address  is
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   excluded  from  this  test.
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^

        Wietse

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