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Below are TMCAS's three (3) detection levels and their corresponding values:

Low7.0
Medium5.0
High4.0

This means that TMASE computes what score to place on an email depending on the spam sensitivity on TMCAS, then tags an email as spam if it meets or exceeds the value of the sensitivity set.

 
Increasing or decreasing the sensitivity level of the Spam rules does not affect how TMASE will score the scanned mails. However, it can help on better spam detection as you increase it because emails with lower scores will now trigger the spam rules.