Very stupid DNS tricks -- the "black hole" DNS

[Jonathan de Boyne Pollard]

JM> My question is, is there a straightforward way to exclude a
JM> particular domain from this black hole effect?  

Yes.

<URL:http://homepages.tesco.net./~J.deBoynePollard/FGA/dns-split-horizon.html#SeparateContentServers>

But you'll be surprised by the number of such "exclusions" that you'll 
end up having to make (in any but the most trivial of cases).