Unless you lose connectivity for days at a time (like 4 days) seriously consider not having a secondary MX. I bet if you examine your logs more than half our spam comes through the secondary.
I can concur on this. We are seriously getting ready to drop our secondary as a result. It has only been helpful maybe 3 times in the last 2 years; however, during those few times, it saved our butts, so we are still torn.
Most of the time, I can easily get to the mail server to fix any problems. As an experiment, I removed the secondary MX records from the DNS (except for the fake ones pointing to the main server). This did cut down the spam.
However, I was unable to get to the main server for a while, so I re-enabled the secondaries. The spam picked back up, but not nearly in the same volume. I was going to switch the secondaries on and off depending on my schedule, but it doesn't seem to be necessary. You may find this a useful strategy.
Neil
Neil Herber
Corporate info at http://www.eton.ca/
Eton Systems, 15 Pinepoint Drive, Nepean, ON, Canada K2H 6B1
Tel: (613) 829-4668
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