Article ID: 124060, created on Dec 27, 2014, last review on Mar 2, 2015

  • Applies to:
  • Plesk 12.0 for Linux
  • Plesk 11.0 for Linux
  • Plesk 11.5 for Linux


High CPU usage for sa-learn and spamtrain processes in the server.


As sa-learn script is used by spamassassin to learn the specific properties of spam from a folder which supposedly contains only spam emails.
CPU usage of the sa-learn process depends on the amount of the emails in mailboxes and its size. Then if the number of emails is huge - CPU overusage is expected.


To workaround the issue use one of three solutions:

  1. Disable the sa-update execution by moving sa-update and spamassassin files from /etc/cron.daily/ to different location.
  2. Clear the mailboxes.
  3. Use nice/renice or ionice utilities to decrease the priority of the process sa-learn.

Search Words


named plesk

sa-learn / execute-spamtrain.php





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