[Spamassassin Wiki] Update of "VirusScannerTypeUpdates" by JustinMason

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The following page has been changed by JustinMason:
http://wiki.apache.org/spamassassin/VirusScannerTypeUpdates

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+ '''UPDATE: this page is pretty much obsolete nowadays; we *are* doing
+ updates.  See RunningSaUpdate.'''
+ 
  It's quite common for people new to SpamAssassin to try to view it as being like a virus scanner. Virus scanners typically release signature updates every few days, and it seems a logical extension to try to do this with SpamAssassin too.
  
  Unfortunately that's not possible in practice because of how SpamAssassin rules work. This is because SpamAssassin works absolutely nothing like any virus scanner.