From: Eray Aslan (eray.aslancaf.com.tr)
Date: Sat Apr 02 2005 - 05:33:52 CST

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> Date: Fri, 1 Apr 2005 08:06:19 -0500
> From: Victor Duchovni <Victor.DuchovniMorganStanley.com>
> Subject: Re: Re: Bounce when unavailable
>
> On Fri, Apr 01, 2005 at 10:02:48AM +0300, Eray Aslan wrote:
>
> > > Do you use DHCP + DynDNS for your Exchange server? Perhaps it removes
> > > itself from DNS when it shuts down and releases its DHCP lease. If so
> > > don't do that! Some DNS server is returning a permanent NXDOMAIN for
> > > this name (not a timeout or SERVFAIL).
> > >
> >
> > No I do not use dhcp for the exchange server. The exchange server is not
> > meant to be reachable from the internet. The problem was, as several
> > people has mentioned, in the transport maps. Changing
> >
> > caf.com.tr smtp:[name_of_the_exchange_server]
> >
> > to
> >
> > caf.com.tr smtp:[ip_of_the_exchange_server]
> >
> > solved the problem. And it is logical. With the local DNS server unreachable,
>
> No, this is the wrong solution (merely a work-around the real problem)
> and this is not how DNS works. When a server is down, you get a timeout
> not NXDOMAIN. If you get different authoritative answers when one DNS
> server is down, your DNS is misconfigured or despite your assurance the
> server does in fact delete itself from DNS.

Right. It was a DNS problem underneath. Semi-fixed for now. Thank you.

Eray

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