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Date: Wed, 17 Jan 2007 07:46:16 -0500
From: Bill Moran <wmoran@collaborativefusion.com>
To: "freebsd" <freebsd@gorlani.net>
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Cc: FreeBSD Questions <freebsd-questions@freebsd.org>
Subject: Re: Balancing outgoing SMTP relay
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In response to "freebsd" <freebsd@gorlani.net>:
> Hi
>  I have a simple question but googling does not lead to a valid/usable
> answer.
> I need to load balance OUTGOING emails. I have serveral smart hosts. I need
> my internal SMTP server to send mail using ALL of the smart hosts together,
> making some kind of load balancing (no need for wheighted one).
> Someone pointed out to use a name for the smart host, and have DNS to
> resolve that name to the IP of all the relays (multiple A records) but this
> turned out in doing failover, not load balancing.
> Anyone has a *working* idea for solving this apparently simple problem?
> Thanks

pf has the ability to do round-robin dispatching, which will sort of work
like load-balancing:
http://www.openbsd.org/faq/pf/pools.html

-- 
Bill Moran
Collaborative Fusion Inc.