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Knowledge Base:  Hosting - Site Management System Plesk 9.x:  Improving Accuracy of Spam Detection

There are two user-adjustable threshholds for spam filtration. The first threshhold 
is for email that is probably not spam. The default setting for this is 4. It is called 
the "Tag engine sensitivity" threshhold. If the Spam Guardian finds that an email 
has a spam  likelihood of less than the tag threshhold level, it will be considered 
good email (ham) and will be delivered normally.
The next level is the "Tagged" level. The default setting for this is between 4 
(The "Tag engine sensitivity") and 6 (The "Drop engine sensitivity"). 
Any email that Spam Guardian finds to be between the tag threshhold and the 
drop threshhold, it will change the subject line to include the term ***SPAM*** (this 
text can also be changed by the user)
Mail with a spam score greater than the drop threshhold (6 by default) will be 
discarded (dropped).

You can make Spam Guardian more sensitive by lowering one or both of the 
numbers. If you reduce the Tag engine sensitivity for instance to 3, then more 
email will be tagged as SPAM. If you reduce the Drop engine sensitivity, more 
email will be discarded. Be careful not to set the drop sensitivity too low, or you 
will start missing good emails.

There are pre-set sensitivity levels that you can use, or you can choose "custom" 
and set it to any number you wish.

Very Strict = 2
Strict = 4
Moderate = 6
Permissive = 10
Very Permissive = 15

  1. Open Plesk
  2. Click the Spam Guardian button
  3. Click the wrench icon next to the domain you wish to manage
  4. Set the sensitivity level(s) desired
  5. Click the Update button
If you would like, you can set up your email software to move marked spam to a separate folder. Instructions are below. To set up filter rules in your email software to move the spam. Click to Set up a filter rule for Horde Click to Set up a filter rule for Outlook Express Click to Set up a filter rule for Outlook 2003 Click to Set up a filter rule for Mozilla Thunderbird
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