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IronPort C-Series Messaging Gateway
Price: $9,995 to $54,950, plus subscriptions
"Reputation Filters" give the IronPort C-Series Messaging Gateway Appliance an edge among antispam products.
The Reputation Filters approach is similar to white-lists/blacklists, but the rate of false positives is much lower. IronPort claims a zero rate; we didn't see a single false positive during our testing.
This was first published in February 2005