Be very careful of running any type of security scan without permission from
those who manage the systems you are scanning. There have been highly
publicized cases where this, as well intentioned as it may have been, has
led to loss of employment and legal action against someone who has done
Try AMaViS (www.amavis.org) with McAfee Viruscan for Unix/Linux (free trial
here: http://www.nai.com/naicommon/buy-try/try/products-evals.asp). There
are other AV products that AMaViS will work with, but I've no experience
with them. I have used AMaViS and Postfix with the McAfee product and
