Some sites are organized so that Internet traffic rarely has access to its network. For example, your site could be hosted on a stand-alone server that you only communicate with when updating files or downloading a database. This architecture essentially creates an off-site host, for those times when you need excellent protection from viruses and other threats to security. Place e-mail virus scanners on all computers. The only real defense against viruses is limiting your risk by using virus scanners and enforcing security measures on network computers.
Most operating systems come with security measures including e-mail scanners.
These programs scan and filter mail for possibly unfriendly attachments. Hire a skilled system administrator. Your administrator should know your system well enough to anticipate when problems might arise. This person will use benchmarks to monitor performance and server logs to monitor trends in performance and traffic. Patches are security updates that cover known holes in the security system.