Linux users have come up with the idea to protect there clients that are using windowz O/S
MIME Defanger is a flexible MIME e-mail scanner designed to protect Windows clients from viruses. It can alter or delete various parts of a MIME message according to a very flexible configuration file. It can also bounce messages with unnaceptable attachments. MIME Defanger works with Sendmail 8.10's new "Milter" API, which gives it much more flexibility than procmail-based approaches.
http://www.linux.org/apps/AppId_5969.html
Introduction
With the proliferation of e-mail trojans and viruses, e-mail is
becoming a preferred mechanism for attacking PC's. The best way to avoid these trojans and viruses is not to use any insecure client software on your PC (especially software from Microsoft, which is notorious for security problems.) Use Linux as your operating systemand one of many excellent e-mail packages as your mail client.:O)
Unfortunately, for many, switching away from installed commercial software is not an option. Therefore, MIMEDefang was created. If software manufacturers will not fix their problems, then we must take matters into our own hands and add a layer of protection around the insecure legacy software.
read more :O)
http://www.roaringpenguin.com/mimedefang/
Now yes Linux users do have a a certain Humor when it comes to Bill Gates wondowz but we also help out !!!