Except for the senders, no one likes spam. Indeed a recent Gartner Group study found that a third of ISP customers want their service provider to stop the spam flow. Fortunately, you can use antispam server programs to block those nagging messages.
Most mail servers come with some type of built-in spam protection.
Although, that functionality sometimes is buried with antiviral protection and can be hard to set up properly. Based on our experiences, the spam filter we like most is Brightmail's Solution Suite. Unlike other antispam programs, Solution Suite is dynamically updated from Brightmail's constantly updated spam databases. That means you can spend your time focused on providing speedier service instead of constantly manually adjusting your spam filters. Of course not, and neither do your users.