[Pkg-exim4-users] Broken DNS servers cause all connections to Defer

[Marc Haber]

On Sun, Jul 29, 2007 at 11:04:42AM -0400, Daniel Collis-Puro wrote:
> 1) Resolve all FQDN in local_host_whitelist / local_host_blacklist to IP
> addresses via a script of some sort, omitting FQDN that don't resolve
> when the script runs,
> 2) Reconfigure exim to ignore domains or time out differently when doing
> DNS lookups.
> 
> Option 1 would be easy but yucky. I'm not entirely sure where to go for
> option 2. We have a caching nameserver in front of our exims, but I
> don't like the idea of molesting DNS lookups too much.

I would probably try if bind or whatever DNS server you use can be
tweaked to return what exim wants to see. The correct thing - in exim
- would be a defer_ok option for the white/blacklist, but exim doesn't
seem to have this at the moment. This would be a worthwhile
enhancement, so there should be a wishlist request in the uptream
bugzilla.

Greetings
Marc

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