Austad, Jay:
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> >> 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?

Pipelining mail into mail.mydomain.com? You speak mysteries.

> Does each message get passed to a random smarthost, or does that single
> session get bound to one smarthost?

Each message is queued separately inside Postfix. Postfix then sends
each message to a randomly chosen smarthost.mydomain.com machine.
Each delivery gets no more than a configurable number of recipient.

    default_destination_recipient_limit = 50
    smtp_destination_recipient_limit = $default_destination_recipient_limit

> 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:

This is configurable in main.cf. The default is:

    maximal_queue_lifetime = 5d

You may also benefit form configuring a fallback_relay that catches
the mail that Postfix can't deliver right away.

All this stuff is described in the sample-*.cf files.

        Wietse
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