postscreen caches SUCCESSFUL tests, with a time-to-live that
is configurable:
postconf | grep '^postscreen[^ ]*_ttl'
If the remote SMTP client did not recently pass the DNSBL test,
then postscreen will fire off a DNS request while the pregreet wait
is in progress.
If postscreen drops a connection immediately, then it will not wait
for other tests (DNS etc.) to complete. You can 't have both
"disconnect immediately" and "wait for ongoing tests to finish".
Wietse
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