The rate of customers who are not "very satisfied" is more than 70 percent for six of the eight types of anti-spam technologies. Commercial software filters, such as those produced by McAfee, Symantec and Trend Micro, fully satisfy just 22 percent of users, the report found. Filters that come with email clients, like those from Apple, IBM Lotus and Microsoft, fully satisfy only 21 percent of customers.
Satisfaction rates are similarly low for business-class email hosting providers, filtering appliances, and reputation systems known as "real-time black lists" from Commtouch, IronPort and Spamhaus. 
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