Great, you should see a considerable improvement.
Go into cPanel > mail > Spam Assassin > and click on the button right under "Enable Spam Assassin" it says:
"Configure Spam Assassin (required to rewrite subjects)"
Once you are in there, you will see "required_score" and that should default to 5. You can lower this number for more filtering or raise it for less filtering. Once you have done that, you can keep the default subject line next to "rewrite_header subject" as **SPAM** or you can get creative.
I used this one: Spam Hits _HITS_ / of _REQD_
The above would rewrite mail flagged as spam to have a subject like:
Spam Hits 6 / of 5 {the original subject here}
This told me that the email scored a 6 of 5 allowed, and would have been automatically trashed if i set the filter up for it. if it were a 4 of 5, it would not have been rewritten (or trashed should you configure it like that) it would have been delivered as normal.
I suggest using subject rewrites for a few days until you have a good threshold (required_score) that you like, then go apply the filter when you are comfortable with the way you have configured Spam Assassin.
Just make sure you keep the Spam box disabled unless you plan on checking and cleaning it periodically because all it does is collect junk. I am cosidering removing it as an option as 99% of the users never check it and it wastes their disk space.
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