Block Offline Browsers

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http://serverfault.com – Is there a way to block offline browsers (like Teleport Pro, Webzip, etc...) that are showed in the logs as "Mozilla"? Example: Webzip is showed in my site logs as "Mozilla/4.0 (compatible; MSIE 8.0; Win32)" Teleport Pro is showed in my site logs as "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT)" I did some tests using the .htaccess file but they all ended up with my browser blocked (Mozilla and Chrome) and of course I don't want to block normal visitors but just the bandwith leechers (that also eat alot of CPU/RAM with theyr requests), plus looks like that this offline browsers even ignor (HowTos)