On Thu, 30 Dec 2004, Kiffin Gish wrote:
> The idea is to have one primary mail system that normally processes
> everything, and a secondary fail-safe mail system that will seamlessly take
> over when the primary server is down.
If you just have two email systems operating in parallel with > 50%
spare capacity, you'll get the behaviour you want for free because of
the way smtp works.
This is assuming that your machines are MXs. If they are submission
servers or smarthosts, the client systems are too crap to implement
failover, so you'll have to use some IP-level failover solution (e.g. a
BigIP from F5 labs, if you want something expensive and full-featured).
Tony.
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