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[drupal=135]Clamav: Quick glance and exim integration[/drupal]

Clamav should be the best anti-virus software for linux, it's widely used and frequently updated for security vulnerabilities. If your server allows some public groups to upload files or serves as mail server, it's highly recommended to have a good antivirus installed, so that every of the unknown files would be scanned, in order to get rid of any potential attacks.