Subject rewrite converts the subject of the email to make spam more noticeable.
Example:
Subject: I love SPAM, it's better than viagra!
<---Processed by Spam Assassin--->
Subject: *****SPAM***** I love SPAM, it's better than viagra!
So you can do a Subject search for SPAM and automatically delete it using a inbound filter/rule (different term depending on your software)
Otherwise, you have to scan for header: X-Spam-Flag which is set to Yes when it hits your threshhold.
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