On Tue, 20 Feb 2001, Gordon Tetlow wrote:
> We use Alteon load balancers to take care of the balancing part, after
> that, qmail just works. We did add a hack for a deferral server option to
> qmail, meaning after 10 minutes of undeliverable mail (configurable), the
> mail gets tossed to another server that tries for up to 2 days before
> discarding. This keeps our frontline mailservers from dealing with all
> the people that can't spell hotmail.com (you wouldn't believe the number).
> The frontline mailservers peaked at about 600-800 messages in the queue
> when sending out the 4 million while the deferral servers were sitting
> about 10000 messages (up from a normal 7000 or so, also we had 8 deferrals
> in rotation).
>
> Also of importance is that we are whitelisted everywhere possible to make
> sure that we are rate limited on the amount of mail we send (aol is a good
> example of that).
>
> I think that describes the general gist of our mail situation.
Forgot to add info about the mailers. Each has a hardware raid controller
with about 32MB of memory on the controller configured to RAID-1 2HDs for
redundancy. Ideally, the mail never actually hits the disk but resides
exclusively in memory.
-gordon
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