On 03/26/2017 09:44 AM, SZÉPE Viktor wrote:
Running bind is too expensive for me.

I'll note that Red Hat's bind package installs with an ideal configuration for a localhost-only caching DNS server. There's virtually no administrative cost, there.

I usually use the caching DNS
resolver in the given datacenter plus µnscd
https://busybox.net/~vda/unscd/  which does local caching for Name
Service - which Courier apparently is not using.

Nope. nscd (and unscd) are not DNS servers, they're caches for the libc nss functions (gethostbyaddr, etc) that aren't used in Courier.

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