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Home » Kerio User Forums » Kerio Connect » Important: False-positive spam detection of emails in 2010 (Certain legitimate email messages could be detected as a spam.)
Pavel Dobry (Kerio)

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SpamAssassin 3.2.5 used in Kerio MailServer's Spam Filter contains a bug causing that all emails sent in year 2010 may get additional 3.188 spam score points. This could lead to marking regular messages as a spam (or blocking the message by the server).

More details can be found at

Update: The issue is fixed in Kerio MailServer 6.7.3 patch 1. Upgrade to this version to resolve the problem.

1. Edit the plugins/spamassassin/rules/ file in KMS installation and change the following line:

original line: header FH_DATE_PAST_20XX Date =~ /20[1-9][0-9]/ [if-unset: 2006]
modified line: header FH_DATE_PAST_20XX Date =~ /20[2-9][0-9]/ [if-unset: 2006]

2. Restart the Kerio MailServer.

File paths:
- Linux: /opt/kerio/mailserver/plugins/spamassassin/rules/72_active.c f
- Mac OS X: /usr/local/kerio/mailserver/plugins/spamassassin/rules/72_ac
- Windows: c:\Program Files\Kerio\MailServer\plugins/spamassassin/rules/72_active. cf

The configuration file can be edited by any text editor. On Linux and Mac OS X running the editor with 'root' privileges is required.

Temporary workaround:
As an immediate workaround please create a new custom spam rule which will decrease the spam score by -3.2 points for every message containing Received header with substring "2010". See the screenshot:


Please note, the workaround has to be removed once the issue is fixed (either by modifying the configuration file or Kerio MailServer upgrade)!

Affected versions:
Kerio Connect 7.0 beta, Kerio MailServer 6.7.3 and older

The fix is highly recommended to all KerioMailServer customers running any KerioMailServer version and using Spam Filter for spam classification !

The patch file for easier file modification can be downloaded from /

[Updated on: Tue, 03 August 2010 10:36]

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