exim4 on sarge can't resolve hosts

[Joe]

I'm building a Sarge machine to replace a Woody, and I can't persuade 
exim4 to do host lookups. All attempts at sending outgoing mail fail 
with:

R=dnslookup defer (-1): host lookup did not complete.
Running exim4 -d -bt says that DNS lookup of abc.de (MX) gave TRY_AGAIN.
All other programs (as far as I can see) have no trouble using DNS. The 
Woody machine running exim3, using the same local DNS cache, has no 
problems.

I vaguely recall having similar problems with exim3 long ago, which I 
think were solved by removing bydns from the remote smtp configuration, 
but exim4 doesn't seem to have that to begin with.

All of the exim4 configuration files are original, update-exim4.cof.conf 
is set for Internet use.
--
Joe

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