Install anti-virus software in your mail
server. The mail server is one of the most serious security threat to most
organizations. Anti-virus software will at least protect you against most of
the known vulnerabilities and viruses. It will usually be no match for a
Consider using a web proxy with
virus protection software as well. Software downloaded from the Internet can
be just as virus infected as e-mails. However, one of the problems with
internet traffic is that it can be easily encrypted, rendering the virus
scanner in the web proxy useless. There are other
problems as well. The web traffic is interactive, while e-mails get sent and
received in the background.
Talking about downloading software from the Internet -
never trust the software you receive from the Internet, even if it comes
from a company you trust. Unless the application is digitally signed, there
is no guarantee that it hasn't been modified on the way to you, or by
someone hacking into the web server that you are downloading it from.