Thank you for the wonderful tutorial. I am also someone who was deeply troubled by MailScanner and the high CPU loads that come with it. Couldn't simply uninstall the damned thing as the spam+virus threat is very real for my clients.

Then I came across your solution and tried it. Now when I test, everything seems to be working fine but when I perform the virus check, mail gets delivered instead of being rejected. Can you help, please?

I need to setup a production server with this solution ASAP... as soon as I've made sure everything works as it should, i.e.

hmm..
Please test by sending Eicar test signature to your mail server and monitor the exim log according to the instruction here:
http://www.rvskin.com/index.php?page=public/antispam#6

Does email get through?

Yes, I did that but the mail went through.

However, I went ahead and implemented this on a production server as this was the only thing missing. When monitoring the logs, I saw it was, indeed, filtering viruses.

Anyways, thank you for this wonderful solution. MailScanner was killing me!