patpro--- via Postfix-users:
> hello,
>
> September 29, 2023 4:30 PM, "Wietse Venema via Postfix-users"
> <postfix-users@postfix.org> wrote:
>
> > postscreen does not duplicate DNS caching. DNS lookup results are
> > already cached in a non-Postfix DNS resolver (see /etc/resolv.conf).
>
>
> OK, this is where I was wrong. I thought postscreen would cache
> the result of the DNS queries for at least postscreen_dnsbl_min_ttl.
> Most dnsbl have a crazy short TTL, I was hopping to get some cache
> here without having to install a tool capable of caching DNS query
> results with TTL override?
Postfix assumes that it will be using a caching resolver. Are you
using a non-caching resolver?
postscreen_dnsbl_min_ttl specifies how long POSTFIX will remeber
the result of a DNBL/WL test - the TEST RESULT, not the DNS response.
Wietse
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