> And how much time would that be? Keep in mind that postscreen > does not always wait for the 6-second pregreet delay. It only > waits when the PREGREET or DNSBL test is not whitelisted.
>From my observation related to DNSBL query time, (https://sites.google.com/site/tomoyukipostfix/) almost all DNSBL queries completed within 350 ms. for zen.spamhaus, b.barracudacentral is more fast, less than 200 ms. If the dead-line are assumed to 350 ms, about 56% of reverse-resolve would be completed. rest of them would be forced UNKNOWN. former(56%) are consist of 47% named and 53% un-named clients. a limited time slot of ~350 ms. is too short for resolving reverse-names. Contrary, If there are time to wait for completion, 95% would gets results within 1.4 sec. from my observation. -- Tomo.
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