Increase in Spam Score After Upgrading to Version 6.0.7

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Article Information

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 file, locate and change 
    score RCVD_IN_PBL 0 3.558 0 3.335 # n=0 n=2
    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
    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
    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

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 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: Date Modified: 03/24/2015

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