Right now, I'm using ezmlm with qmqp modifications that will balance the
load between multiple qmqp servers, if I run out of outbound capacity, I can
just add more qmqp servers (qmail). However, administration of lists with
ezmlm is starting to become a big pain, and I don't particularly like all of
the tedious crap involved with using qmail, especially in my setup.

I'm planning on replacing the ezmlm/qmail list server box with a
postfix/smartlist setup. I'm planning on having postfix send all outgoing
mail to my "splitter" box, which forks off the outgoing mail to several
qmail QMQP servers (I'm keeping these). I'm choosing smartlist because it
uses the choplist program which will split my outgoing lists up into many
messages grouping addresses for the same domain into one message, and with
multiple messages, my load balancing mechanism will have a little bit more
uniform distribution.

Here are my questions:

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.

2. Say I have a single message with 1000 aol subscribers as recipients,
will postfix open one connection and just send across the one message with
all of those recipients, or will it send multiple messages? How about if I
have 1000 separate messages all to AOL subscribers, will it open one
connection and pipeline, or 1000 separate ones?

3. What should I keep in mind when setting up/compiling postfix on the main
list server? Is there anything special I need to do to increase the
performance of the queue? (my qmail box is getting hammered because of the
size of the queue) Can I easily change the amount of time a message is
allowed to be in the queue? (many of our mailings are time sensitive)

4. What is the maximum number of outgoing concurrent connections I can
possibly have? I saw that you have to do a -DFD_SETSIZE=xxxx when compiling
to get enough threads. But under freebsd 4.4, do you also have to recompile
the kernel to make it work correctly when doing a lot of connections?

----------
Jay Austad
Network Administrator
CBS Marketwatch
612.817.1271
austadmarketwatch.com <mailto:austadmarketwatch.com>
http://cbs.marketwatch.com
http://www.bigcharts.com

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