I just put our imail server behind a hardware firewall - Firebox.
Is that the Watchguard Firebox? If so, make sure not to enable the "DNS
Proxy." It's has a serious flaw in it, that they won't bother to fix -- if
you use it, it will occasionally drop DNS packets. Fortunately, though, if
the "feature" is disabled, there are no problems.
-Scott
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