>Before that, I thought
>if I could run a caching dns on the machine that only responds to requests
>made by i-mail, that I could increase delivery times. I have not been able
>to find a way to do so. I can set up the DNS to be caching only (thats easy)
>but I need to make it only respond to itself. Does anyone know how I can
>achieve this?
That depends entirely on what DNS software you are using. But, it would
only get used if someone happened to discover that you have a DNS server on
that machine, so it is unlikely that it would get used. If you are
concerned, and can't get the DNS software to only accept connections from
the local machine, you can have your firewall block DNS packets to that
server (which you should probably be doing anyways).
-Scott
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