Hi Prasad,
As others have pointed out, this shouldn't be necessary. The Symantec Global Bad Senders IP list is queried via DNS and you should be getting updated anti-spam rules from our servers every few minutes.
If your spam definitions haven't updated in 4-5 days as you mentioned, you should open a case with Technical Support to investigate the reasons why. You'll still have spam scanning but with lower effectiveness as spam attacks change very quickly - hence the reason why we deliver new filters so quickly.
Hope that helps,
Amanda