  Anatomy of a mail rule
Each mail rule takes the same basic form:
• the header to perform a test on
• the test to perform
• the action to take if the test is successful.
Note
A colon (:) always separates the header from the test
Here is an example of a simple mail rule:
X-Mailer: "Millennium Mailer" SET $spamlevel +=75
where
• X-Mailer is the header on which to execute the rule
• the test to perform is, whether the X-Mailer header contains the data Millennium Mailer
• the action to perform, in this case, is to add 75 to the $spamlevel variable
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