My web host company handles my email & they run it through Apache Spam Assasin.

Using CPanel, I only see options to black/white-list domains, but I would like to mark as spam based on certain words in the email subject. 

Is it on-topic to ask on this site how to do so?  

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[Update] ServerFault Meta [says](https://meta.serverfault.com/questions/9404/is-spam-assassin-via-cpanel-configuration-on-topic/9405#9405) that this question is off-topic there