On Wed, Mar 25, 2009 at 11:07:04PM +0100, mouss wrote:
> I am trying to "collect" methods to setup postfix in an HA
> configuration, for "outbound" relay (no MUA involved). a use case is
> using multiple postfix boxes to relay mail out for one or more exchange
> servers. there are many possibilities. which one is
> "good/recommended/easy/blahblah"? This is somewhat off topic since the
> problem is mostly on the client (exchange or other) side rather than
> postfix. but I think this is a real need. and if I get enough infos, I
> can aggregate them and submit that as a howto/readme.
If the Exchange servers are able to cache connections, just use equal
weight MX records. Otherwise, and perhaps in any case, configure low
SMTP connect and HELO timeouts, and set high (Exchange facing) smtpd(8)
process limits on the Postfix servers to ensure the that the total # of
available Postfix connections comfortably exceeds the Exchange outgoing
connection limit.
That's it, if all the Postfix servers are up all is well, and if one
is down or slow, Exchange uses the other one(s) with low additional
delay.
--
Viktor.
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