pvdberg00 Thu, 05/24/2007 - 10:48
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Just play with the mx records.

Example:
mydomain.nl MX 10 firstC300
mydomain.nl MX 20 secondC300

Donald Nash Thu, 05/24/2007 - 23:21
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Why use an active/passive setup instead of active/active? Just have equal-preference MX records and let the traffic split. Then if one unit fails, the other gets the whole load. In addition to simplicity, this also keeps both units exercised, so you'll be less likely to be surprised by a spare that turns out to be bad, too.

In our case, we have a large stable of IronPort MGAs, so we use a single MX record and a load balancer to split the traffic, handle failure isolation, etc. But load balancers tend to be expensive, and may be outside the budget of a shop small enough to need only a pair of C300s.

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