At the moment, the DNS setting in Imail points to the box that
IMAIL also resides on, which is my current DNS server. Now, when I
disable recursion on that box, I am assuming that IMAIL is going to
need to be pointed to a recursive DNS server?
Of course. How else can Imail obtain DNS answers?
If IMAIL is pointed to my new caching only DNS server, is that not
going to slow things down?
A tiny bit as the DNS query/response will traverse the LAN, less
than 1 msec?, with usually much less than 500 bytes total per
query/response transaction, rather DNS than be local to the Imail
box, but I bet you'll not be able to measure it, nor experience any difference.
Another point is that on any box where MS DNS is providing recursive
service, you'll have to block Internet access to that box's port 53.
Len
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