I cannot determine whether you're looking for a qmail virus scanner or some other kind scanner.
Anyhow, Darrell May, myezserver.com wrote a perfect rpm for including the RAV virus scanner into sme5.x. pannel (rav-sme55-howto.htm). This rpm still works on 6.0. It has a lot of options like those you need. Unfortunately M$ has as good as *killed* the company but virus updates are at the moment still available. After install you get a 60 day full working trial version. Plenty of time to find out how the scanner is embedded in Qmail.