On Mon, 17 Nov 2003, Tim Jackson wrote:
> Hi Marilyn, on Mon, 17 Nov 2003 12:29:14 -0800 (PST) you wrote:
>
> > We accidentally pulled the plug on our mail-server and when it came
> > back up, exim 4.22 was temporarily rejecting all incoming external
> > mail, looking like this in the log:
> > So, what happened?
>
> Bit of a guess this, but it looks like it could well be to do with DNS.
> How is your DNS handled - do you have a resolver (e.g. BIND) running on
> the same machine as Exim? If so, I've seen the same thing happen a number
> of times.
Thank you for your thought, Tim.
Deliberate.com's dns is pacbell.net name servers. We don't run our
own.
We were running tinydns but not serving any data -- artifact of
testing and learning. We stopped that and it did not help.
I was thinking it could have something to do with permissions on the
directory where we do a dsearch for local domains ... but they look
fine and nothing changed there.
There's nothing to fix now. It works -- or I couldn't receive messages
from this list.
Most mysterious.
Thanks again.
Marilyn
>
> You'll have to excuse me being a bit vague here, but I've never had time
> to look into the details of the configuration or how BIND works to find
> out precisely what's going on, but basically I've seen a number of times
> that BIND (at least in some default installations of Red Hat) isn't happy
> (i.e. runs but doesn't resolve anything) in the immediate aftermath of a
> reboot, which consequently causes issues like you saw (the temp failure
> being due to an inability to resolve the sender's domain as you have
> verify=sender).
>
> The simple fix is just to restart BIND and things start working (in fact,
> I think I recall doing a "hack" on some machines which HUPs BIND shortly
> after reboot just to make sure this doesn't happen). I would speculate
> that it's some kind of timing issue, where the network interface(s) aren't
> fully initialised before BIND starts or something along those lines.
>
> Is that any help?
>
> Tim
>
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>
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