MailScanner + Postfix => very slow...

[W S]

Hi,
  I’m running MailScanner (vers. 4.63.8) with Postfix (vers. 2.2) on Red Hat ES 4.
  The system is processing over 200,000 emails per day, BUT most of emails (about 95%) are junk / spam and if queue gets over 10,000 it’s freezes all delivery process.
  Are there any parameters that I can tweak to speed-up the delivery process?
   
  Thanks,
  --WS

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