Hello, An eCAP adapter to filter messages using the popular ClamAV library is now available: http://www.e-cap.org/Downloads ClamAV API forces the adapter to accumulate content in files, one file per message, but using memory-based file system for the staging directory may help speed things up. See README file for some basic tuning options. When a virus or other blocked content is detected, the adapter sets the X-Virus-ID meta-header, which you can log to access.log using the %adapt::<last_h logformat code. You will need Squid v3.2.0.6 or newer to use the adapter. Enjoy, Alex. P.S. Individual eCAP adapters are not supported by the Squid Project. Please contact adapter developers with any adapter-specific feedback.