From: Bill Cole (postfixlists-070913billmail.scconsult.com)
Date: Fri Oct 05 2007 - 09:08:56 CDT

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At 2:25 PM +0100 10/5/07, Ward, Martin wrote:
>Why don't you rely on DNS like everyone else does?
>
>If you build the servers identically, but with different IP
>addresses, tand specify both servers in your MX record, if one
>server goes down the second one will take up the load. If both are
>running fine then your mail will get processed at twice the speed!
>

That is generally true, and for many years I've argued against
invisible load-balancing for MX servers, but lately I've become less
sure of that judgment. It looks from the systems I work with like
there is a significant per-MX overhead in spam load. I've taken a few
domains from 2 to 3 MX's recently and seen a 25-40% bump in total
spam load within 2 weeks in each case.

Of course, that does not mean that it is necessarily a better idea to
mask multiple MX servers behind a load balancer with one IP. If it's
just a simple load balancer, it may be a single point of failure
itself.

--
Bill Cole
billscconsult.com

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