Re: [Exim] random bounces

----- Original Message -----
From: <michael@???>
To: <exim-users@???>
Sent: Wednesday, September 20, 2000 9:54 AM
Subject: Re: [Exim] random bounces


> > We always use a local caching nameserver in our configurations -
actually
> > we have two main nameservers, one which "faces inwards" [which knows
> > authorative answers for all our domains plus local bits we don't want
the
> > internet at large to see] and one which faces outwards and does real
> > resolving.
> >
> > The mail hosts talk to the inner nameserver which forwards requests to
> > the external one, the inner nameserver has a config in the form:
>
> Note that this can lead to trouble if domains are moving to you or
> away from you. Caching name servers are indeed _very_ helpful for
> performance, but if your inner server feels authorative for a zone that
> moved to a different provider, mail may be sent to the wrong host.
>
> Michael

I think that the performance advantages by running a local cache and
the improvement over the DNS oddities such as unreachable nameservers
far outweighs the likliood of mis-deliveries as a problem...

Mike