Symantec Messaging Gateway refreshes virus definitions in periodically, even though new viruses may not be discovered. This allows administrators to check whether their protection is up to date by simply looking at the date of their virus definitions.
Virus definitions for Symantec Messaging Gateway are kept up to date through automatic LiveUpdate. Automatic LiveUpdate can be configured to check for updates on a schedule defined by the administrator. When a new definition update is available, LiveUpdate will detect it and automatically download it to the Symantec Messaging Gateway scanner. Symantec Messaging Gateway can also be configured to download previously obtained virus definitions from a LAN host, rather than from Symantec servers.