Am 15.09.2016 um 13:20 schrieb Pekka Jalonen:
Server is mail server with ~+150 K users.
Problem is procmail + postfix with rbl's (zen.spamhaus.org and others).
Really big problem are spam botnet's and some day we can get over 5-6
million messages per day or even more.
Procmail/postfix is doing every check per msg at localdns (localdns =>
rbl's) server and average check time is 1-2 sec per message and it's
too much
bind is probably the wrong software for that task
if the caching-resolver is only for inbound mail use unbound
"cache-min-ttl: 100" violates standards but on the other hand works
around the 5 seconds TTL of many RBL and may reduce the outbound
dns-requests at peak times dramatically without much bad impact (slip
through while listed within the 100 seconds)
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