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.
OK, solved it. When you have eliminated the impossible....
I'm using an Alcatel Speedtouch V3.7 ADSL router, which contains a caching DNS server. Unfortunately, it only responds to A and ANY enquiries.
The Woody installation has a caching server, I didn't think I'd bother with the new one as there is one in the router.
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Joe
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