We are using a free spam filter VMware appliance called ESVA. This is a beautiful product - I've been running this appliance about a year, support about 50 accounts. I'll show off a little of the features..
We get no reports of false-positives.
We get less than 5 spam messages a month to the larger accounts.
We can easily blacklist and whitelist.
The product is FREE! (http://global-domination.org/ESVA)
Check out some stats:

You can download our whole report for rule hits - this shows what percentages of spam hit what rules to make them designated as spam, very cool | DOWNLOAD
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