>> 1. Say I have 4 smarthosts, can I specify all of these smarthosts in the
>> postfix config and have it relay messages to them randomly to load
balance
>> between them? I'd like to dump the qmail stuff completely, but right
now, I
>> can pipeline messages into my splitter box, and it will randomly
distribute
>> them nicely to all of the qmqp servers.
>
>If you provide one DNS record with 4 addresses, then Postfix will
>randomize the connections. Code from Elias Levy of Securityfocus :-)

So if I have a server at mail.mydomain.com, and it's set to forward all
outgoing mail to smarthost.mydomain.com which has 4 different A records
assigned to it, what happens when I pipeline mail into mail.mydomain.com?
Does each message get passed to a random smarthost, or does that single
session get bound to one smarthost?

Thanks for your help, this helps me a LOT. I have several very large lists
(average 500,000 subscribers each) which are sent out daily, and are time
sensitive (must go out within the hour). The current system will saturate a
DS3 with outgoing mail, and I'd like to keep at least the same performance,
but the lists are growing rapidly, and you can't set the concurrency on a
host by host basis with qmail and it's not smart enough to back off if the
remote server is slow. Qmail seems nice and fast, but I don't really want
to keep using it without some sort of control over how fast it sends to
individual hosts since I don't really want to get angry calls from mail
admins when our lists get larger. It hasn't happened yet, but it's bound to
unless I do something about it now. Plus, we are launching an "alerts"
product soon where portfolio account holders can set certain criteria and
they will be emailed when that criteria is met (like stocks hitting certain
prices or news on specific companies), and this is going to generate even
more mail.

I do need to figure out how to set the queue lifetime though. The messages
are useless after a day or so, so I might as well not send them if they
can't be sent for that long. How hard would it be to make postfix
understand an entry in the header which specified how long the message
should be in the queue? Something like:
X-Queue-Lifetime: 86400
to specify that it would be dumped out of the queue or bounced after 1 day.

Jay Austad
Network Administrator
CBS MarketWatch
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