SpamAssassin Spam Filter – Switching on SpamAssassin

To switch on SpamAssassin:

1. Go to Tools & Settings > Spam Filter (in the Mail group).

2. Select the option Switch on server-wide SpamAssassin spam
   filtering.

3. To let your users set their own spam filtering preferences on a
   per-mailbox basis, select the option Apply individual settings to
   spam filtering.

4. (Plesk for Linux) Define how much resources SpamAssassin can consume
   in the Maximum number of worker spamd processes to run field. The
   more resources you allocate, the faster SpamAssassin will process
   mail. However, if you allocate too much resources, it may impact
   other services. We recommend that you use the default value.

5. Adjust the spam filter’s sensitivity by typing the desired value in
   the field The score that a message must receive to qualify as
   spam.

   By default, the filter sensitivity is set so that all messages that
   score 7 or more points are classified as spam. If your users still
   receive spam messages with the default sensitivity, increase it by
   setting a lesser value, for example, 6. If SpamAssassin marks valid
   messages as spam, decrease the sensitivity by setting a higher value.

6. Define the maximum size of messages that SpamAssassin will process.
   To do so:

   • (Plesk for Windows) Select the Do not filter if mail size
     exceeds specified size option and provide the desired value.
   • (Plesk for Linux) Edit the /etc/psa/psa.conf
     file.

7. Specify how to mark messages recognized as spam in the field Add
   the following text to the beginning of subject of each message
   recognized as spam. If you do not want the spam filter to modify
   message subject, leave this box blank. If you want to include into
   the subject line the number of points that messages score, type
   _SCORE_ in this box.

8. (Plesk for Windows) Specify trusted languages and locales using the
   lists Trusted languages and Trusted locales.

9. Click OK.