[Pkg-exim4-users] Configuring a fallback mailserver

[Andreas Metzler]

On 2006-01-03 "Dautzenberg, John" <j.dautzenberg at heerlen.nl> wrote:
> We're currently running a Mail-Firewall which acts as the
> SMTP-server for our company and handling mail for several domains.
> In addition to this system I want to setup a fallback-server in case
> the primary server has an outage. (At this moment this is still done
> by our providers smtp-servers). I setup a Debian Sarge linux-box
> which runs smoothly but I have no knowledge on Exim4.
[...]

Hello,
If you've got no knowledge of exim4 why do you end up in a position to
set up a mail-server running exim in a production environment? Exim is
the default MTA, but if you are familiar with e.g. sendmail or postfix
there is absolutely no reason to run exim just for this single job.

> The fallback-server only needs to forward mail for defined domains
> in case the primary server isn't available, and may not be abused as
> a mail-relay ofcourse. Howto set this up?

Start with upstream's default configuration and strip it down to a
single router/transport. (Either manualroute or dnslookup, depending
on your needs.) You'll probably want to use callouts for
recipient verification.
               cu andreas
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