optimisation hints required & broken links on wiki

[Sandro Dentella]

Hi,

  I 'inherited' in these days a mailserver in which there are huge delays. I
  need to optimize but reading the wiki I discovered some relevant links are
  broken, namely:

  How to run a DCC:
       http://www.mailscanner.info/serve/cache/312.html

  Bayes growing out of control
       http://www.mailscanner.info/serve/cache/317.html
  
  How to manually train SpamAssassin:
      http://www.sng.ecs.soton.ac.uk/mailscanner/serve/cache/98.html

  I'd appreciate any hint on how to get to those pages.


  In the meanwhile I'like to better understand where I should concentrate to
  get a more responsive server.  Main problem is that often the queue goes
  higher that 5000 messages and some messages are delivered after 1 hour and
  even more.

  My hardware setup should be quite fast:

  * dual xeon 3GB server - 4GB RAM around 50.000 mail/day concentrated in
  * working time postfix on debian sarge - mailscanner 4.57.6 DNS is local
  * (named from bind9) load average is normally low (1-4) cpu around 4%
  

  Max Unscanned Messages Per Scan = 10
  Max Unsafe Messages Per Scan = 10
  Spam List = ORDB-RBL

  in this moment average time is high:

     Batch (10 messages) processed in 51.55 seconds 
     Batch (12 messages) processed in 57.42 seconds 
     Batch (13 messages) processed in 46.37 seconds 
     Batch (14 messages) processed in 52.74 seconds 
     Batch (11 messages) processed in 46.81 seconds 
     Batch (12 messages) processed in 48.57 seconds 
     Batch (10 messages) processed in 29.24 seconds 
     Batch (12 messages) processed in 42.29 seconds 
     Batch (14 messages) processed in 36.74 seconds 
     Batch (10 messages) processed in 35.31 seconds 
     Batch (12 messages) processed in 41.79 seconds 
     Batch (10 messages) processed in 42.96 seconds 

     and later:

      Batch (12 messages) processed in 119.03 seconds 
      Batch (12 messages) processed in 113.34 seconds 
      Batch (12 messages) processed in 144.11 seconds 
      Batch (10 messages) processed in 142.57 seconds 
      Batch (10 messages) processed in 148.63 seconds 
      Batch (13 messages) processed in 120.17 seconds 
      Batch (13 messages) processed in 109.28 seconds 
      Batch (11 messages) processed in 152.12 seconds 
      Batch (10 messages) processed in 226.92 seconds

  compared with what stated in the wiki (below 3 seconds)
  Is there a way to understand how is time spent?


  According to ps ax, MailScanner is mainly busy with 
  SpamAssassin

 9030 ?        S      0:08 MailScanner: checking with SpamAssassin

  I'd really appreciate any hint / document to read. This situation is
  becoming more and more important to me...
  
  Tanks a lot in advance
  sandro
  *:-)