This is an excellent suggestion.  I can't wait to see it implemented.

In the mean time, it's worth taking a look at WeightGate.exe (FREE).
http://kb.armresearch.com/index.php?title=Message_Sniffer.TechnicalDetails.Tools

I am personally using it with Message Sniffer and invURIBL with great success.

- Chris

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  ----- Original Message ----- 
  From: Scott Fisher 
  To: Declude.JunkMail@declude.com 
  Cc: Support - Scott 
  Sent: Tuesday, November 28, 2006 7:43 AM
  Subject: [Declude.JunkMail] method for reducing CPU load


  I've been mulling this one over as I watch my spam filtering CPU time slowly 
taking over the email server. And I don't expect the number of emails to go 
down.

  For external programs and filters I think it would be a good idea to add two 
optional fields to the global.cfg definition line: a minweight and a maxweight. 
These would be the last two arguments and optional so existing configs would 
not need to be changed.

  For an external program:
  INV-URIBL external  25 "D:\INVURIBL.exe %WEIGHT% %REMOTEIP%"  25 0
  would become
  INV-URIBL external  25 "D:\INVURIBL.exe %WEIGHT% %REMOTEIP%"  25 0  -50  300
  in this case invuribl would only get run if the current weight was between 
-50 and 300.

  For a filter:
  ATTACHMENT-GIF  filter    D:\ATTACHMENT-GIF.txt   x   0   0 
  would become
  ATTACHMENT-GIF  filter    D:\ATTACHMENT-GIF.txt   x   0   0   -50  300
  in this case the attachment-gif filter would only get processed if the 
current weight was between -50 and 300

  Here's why I think this is a good idea:
  Declude could check the weights before launching the external program. If it 
is over/under weight the external program would not be launched.
  2 if statements to avoid launching a program. That seems like a CPU time 
saver. Especially when multiplied by 10,000s of emails per day.
  I use 6 external programs. I believe over half of the program launches would 
be avoided because of stuff that has already been declared obvious ham or 
obvious spam.
  My final of the 6 programs, gets weight skipped over 90% of the time. 
  At 10,000 emails a day, avoiding 50% of the external programs would save 
30,000 program launches a day. I believe my 50% to be a conservative number and 
I think that the percentage would average out to be even higher.

  Now I have about one hundred filters. The vast majority of them get triggered 
with the skipweight since the email is already at a high spam weight by the 
time it reaches the filters.
  But still every one of these filter files needs to be opened, read and closed 
for every email.
  Again 2 IF statements per filter could avoid opening 100 files. That seems to 
me to be a CPU time saver.
  By the time, email reaches the filters, I think 75% of it is bypassing 
filters by being over the skipweight. At 10,000 emails a day (small to many of 
us). That would mean 750,000 filter files a day would not need to be open, read 
and closed.

  From the programming side, I don't believe the coding changes to be too 
difficult. Weight verification/processing code already exists in the Declude 
program. It would just need to be relocated.

  I'm a pretty small user here, getting about 14,000 spams on a weekday. 
Imagine the potential CPU savings for scaling this up to an ISP with 100,000 
emails per day.

  I don't know if this would have an impact on saving my CPU or not, but it has 
to help even if it is a little.
  Please consider this.

  -----------------------------------------------------
  Scott Fisher
  Director of IT
  Farm Progress Companies
  191 S Gary Ave
  Carol Stream, IL 60188
  630-462-2323

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