[Mimedefang] long dns timeouts when first dns in /etc/resolv.conf is down

[Bill Cole]

On 14 Mar 2016, at 12:08, G.W. Haywood wrote:

> Hi there,
>
> On Mon, 14 Mar 2016, Marcus Schopen wrote:
>
>> ... It shouldn't make a difference to mimedefang if one of the dns
>> server is down. Any ideas?
>
> Run a nameserver of your own?

This is ALWAYS the right approach for a mail system that traffic 
directly from the Internet. A caching resolver on the same host as each 
MTA or at least a resolver on the same LAN segment (i.e. LOW-LATENCY) is 
critical to performance in a modern mail system.