Balancing outgoing SMTP relay

Bill Moran wmoran at
Wed Jan 17 12:46:17 UTC 2007

In response to "freebsd" <freebsd at>:
> 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:

Bill Moran
Collaborative Fusion Inc.

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