Increase in Spam Score After Upgrading to Version 6.0.7

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This article applies to the following ZCS versions.
  ZCS 6.0 Article  ZCS 6.0


In the upgrade to 6.0.7, the spam-assassin cf files were updated using the latest files provided by SpamAssassin. In these files there has been a number of changes to the way SpamAssassin will score messages. The following are changes that have been made that has significantly increased the spam score

RCVD_IN_PBL score in 6.0.6 was 0.905, in 6.0.7 the score is now 3.335. To return this score back to the 6.0.6 level, you will need to make the following changes:

 Go to /opt/zimbra/conf/spamassassin/ and edit 50_score.cf file, locate and change 
  
    score RCVD_IN_PBL 0 3.558 0 3.335 # n=0 n=2
 To
    score RCVD_IN_PBL 0 0.509 0 0.905 # n=0 n=2
 
 Edit STATISTICS-set1.txt file, locate and change 
 
    39.995  58.9770   0.0262    1.000   0.94    3.56  RCVD_IN_PBL
 To 
    20.145  31.4714   0.1790    0.994   0.65    0.51  RCVD_IN_PBL
 
 Edit  STATISTICS-set3.txt file, locate and change
 
    39.995  58.9770   0.0262    1.000   0.94    3.33  RCVD_IN_PBL
 To 
    20.145  31.4714   0.1790    0.994   0.65    0.91  RCVD_IN_PBL

FREEMAIL_ENVFROM_END_DIGIT was added. SpamAssasin bug 6155 reported that this value is to high and is marking valued messages as spam

https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6155


DOS_OUTLOOK_TO_MX was added which is causing messages sent by Outlook users to be marked as spam. To prevent this, you will need to comment out the following link from 50_scores.cf which is located at /opt/zimbra/conf/spamassassin.

 score DOS_OUTLOOK_TO_MX 2.636 1.449 1.737 2.845


To have the system load the changes you will need to restart the spam filter by running;

   zmantispamctl stop
   zmantispamctl start

Note: These files could be replaced the next time you upgrade your system.

Verified Against: ZCO 6.0 Date Created: 6/29/10
Article ID: http://wiki.zimbra.com/index.php?title=Increase_in_Spam_Score_After_Upgrading_to_Version_6.0.7 Date Modified: 07/16/2010


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