How can I set up a filter file to detect and block virus attachments?
A0509: Exim’s filter facilities aren’t powerful enough to do much more than very crude testing. Most people that want virus checking are nowadays using one of the separate scanning programs such as exiscan (see http://duncanthrax.net/exiscan/). There is some further information about scanning with Exim via http://www.timj.co.uk/linux/exim.php.