On 13 Feb 2002, Simon J Mudd wrote:
> The secondary mail servers don't have to "deliver" the mail. They can
> just try and send it to the primary server, when this becomes
> available. Setting up a mailserver in this way is very easy - all you
> may need to do is lengthen the time mail is held in the queue.

Ahh, that sounds like exactly what's necessary in our case. What's needed
to tell the backup to hold on to the mail for a few hours and then try
again, and to keep trying for a while even if the primary's down? I'm
going to go look through the Postfix docs again -- it's probably
reasonably obvious.

> That doesn't matter, though normally you use a remote host so if the power goes
> you don't lose both machines...

In our case, both machines are in the audible.com domain, but one's in our
HQ building and one will be out at our colo facility.

Actually, this brings up an interesting question. We are actually running
two primaries -- one for our headquarters and one for our web site at the
colo. Would I be able to use the one at the colo as a secondary for our
hq primary, or would it then not work properly delivering mail to the
recipients on itself? It sounds like really, a given machine should be
either a backup or a primary, but can't be both (which makes intuitive
sense to me, anyway).

> The "backup machine" must accept mail for the domains which you you
> host, but this does not mean that you need to duplicate
> "delivery/final destination information" on the backup machine. You
> may just add the domains you want to backup for to relay_domains and
> do little more than have a standard postfix installation. It probably
> makes sense to use the same UCE fiters on the backup machine too.

Sounds good. All I'd have to change is the delivery attempt information,
then, which I'll try to find now.

Thanks very much.

-Adam

Adam Levin, Senior Unix Systems Administrator | http://www.audible.com/
Audible, Inc. Savoring the strange, warm glow of being much more
Wayne, NJ, 07470 ignorant than ordinary people, who are only ignorant
973-837-2797 of ordinary things.

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