It would certainly be more optimal to have the caching DNS server on
the IMail box.
Agreed, but not feasible at this time.
According to Len, having Imail look to the caching DNS server isn't
going to slow things down noticeably, which was my primary concern.
The setup you are doing is not the best for high-volume DNS, but I
suspect your DNS load is light, so which machine is recursive-only
and which is authoritative-only is not important.
Len
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