change X-priority in header

Hello,

I'd like to check for key words in the body and if found change the 
X_priority to high and then deliver. Something like this:
 :0E
 * ^Subject:.*log
 {
   :0Bc
   * (authentication failures|invalid users)
   change header action????
  
   :0
  
   .billinux.Logs/new
 }

Thanks :)

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