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I also agree, we have been using Cloudmark for the last year and it has been by far the best spam filter we have used. (We used to use spam assassin for our old email server)
Although the occasional spams still get through (though these are minimal), the feature that distinguishes this product for us is the zero number of false positives we have had (e.g. real emails identified as spam), which is why we will be sticking with Cloudmark for the foreseeable future (spam assassin we found just wasn't effective enough or detected too many false positives - very bad to lose any emails)
The only issue we have had with Cloudmark is that occasionally the plugin can take a while to startup if its definitions are out-of-date (though this might be because our mail server is an ancient machine), but as we don't restart it that often I don't really class this as a problem..
Alastair Burr
Software Engineer, Bluestar Software
Telephone: +44 (0)1256 882695
Web site: www.bluestar-software.co.uk
Email: alastair.burr@bluestar-software.co.uk
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